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There have been various theories and models proposed over time to help us understand why individuals use alcohol and other drugs, and why some people become dependent or ‘addicted’ but not others. The following are several models or theories of addiction. They reflect the political, medical, spiritual, and social forces of those times in history.

The Moral Model

Alcohol and tobacco was introduced in the Western countries during the 1500’s. The widespread use and misuse of chemical substances resulted in a range of social problems and it was thought by some that substance use was “problematic” and “morally wrong” (Lassiter & Spivey, 2018). The moral model viewed AOD dependency as a moral and personal weakness that involved a lack of self-control, and was often viewed as a potential danger to society (Stevens & Smith, 2014).

The moral model considered addiction a “sin” and a result of free, yet irresponsible, choice. Therefore, many politically conservative groups, religious groups, and legal systems tended to punish the individual who uses AOD. The moral model or attitude towards addiction can still be seen today in certain cultures. Those who still believe addiction is morally “wrong” tend to perceive the most appropriate way to treat the individuals who use AOD are through legal sanctions, such as imprisonment and fines. For example, in many countries, drivers who are caught under the influence of alcohol or other drugs are not considered for treatment programs but instead receive court sentences as punishments (Fisher & Harrison, 2017).

This model has been rejected by alcohol and other drugs professionals as unscientific and contributes to the stigma surrounding addiction and substance use (White, 1991, cited in Fisher & Harrison, 2017).

The Disease Model

This model takes up the medical viewpoint and proposes addiction as a disease or illness that an individual has. It proposed that addiction is a disease that is progressive and chronic whereby the individual holds no control as long as the substance use continues. In other words, their addiction will continue to deteriorate with the continuous AOD (Thombs & Osborn, 2019). It also proposes that individuals who uses AOD can never be cured from addiction, though it can be readily treated through sustained abstinence such as self-help fellowships and treatment community. 

In the 1940s, Jellinek proposed a disease model in relation to alcoholism, arguing that it is a disease caused by a physiological deficit in an individual, making the person permanently unable to tolerate the effects of alcohol (Stevens & Smith, 2014). Jellinek identified signs and symptoms and clustered them into stages of alcoholism, as well as progression of the disease, which form the basis of 12-step or Anon-type programs (e.g., Alcoholics Anonymous and Narcotics Anonymous; Stevens & Smith, 2014). 

Under the disease model, treatment requires complete abstinence. Once an individual has accepted the reality of their addiction and ceased substance use, they are labelled as being in recovery, but are never ‘cured’ (e.g., “Once an alcoholic, always an alcoholic”; Thombs & Osborn, 2019). Whilst originally applied to alcohol dependency, it has now been generalised to other substances and many traditional substance use treatment models are based on this model (Capuzzi & Stauffer, 2020; Stevens & Smith, 2014).

The disease model offered an alternative to the moral theory, helping to remove the moral stigma attached to addiction and replacing it with an emphasis on treatment of an illness (Capuzzi & Stauffer, 2020). Disease theory helped to explain how some people experience the physiological effects of addiction such as dependence, tolerance, and withdrawal more than others, and how these mechanisms are caused by a biochemical abnormality in an individual which increases their likelihood of developing a dependency (DiClemente, 2018). 

While the disease model was well received by a range of professionals, many criticised it because research did not find that the progressive, irreversible progression of addiction through stages always occurs as predicted (Capuzzi & Stauffer, 2020). Additionally, many in the AOD field argued that the model did not address the complex interrelated factors that accompany dependency (Stevens & Smith, 2014). Finally, some professionals argued that the concept of addiction being a disease may also convey the impression to some individuals that they are powerless over their dependency and/or not responsible for the consequences of destructive addictive behaviours, which can be counteractive to treatment (Capuzzi & Stauffer, 2020).

Genetic and Neurobiological Theories

These theories suggest that some people may be genetically predisposed to develop drug dependency. For example, individuals usually begin substance use on an experimental basis. They then continue using because there is some reinforcement for doing so (e.g., a reduction of pain, experience of euphoria, social recognition, and/or acceptance, etc.). Some people may continue to use substances in a controlled or recreational manner with limited consequences while others progress to non-medical use and eventually develop a dependency. Why? Genetic and neurobiological theories propose that this is the result of a genetic predisposition to drug dependency (Fisher & Harrison, 2017). 

Factors being considered by researchers in the genetic transmission of dependency on alcohol include neurobiological features such as an imbalance in the brain’s production of ‘feel good’ neurotransmitters or in the metabolism of ethanol, which is the key component of alcohol (Stevens & Smith, 2014). Other researchers explored genetic differences in temperament and personality traits which they argued may lead to certain individuals becoming more vulnerable in the face of challenging environmental circumstances, leading to AOD use (Stevens & Smith, 2014). Genetic predispositions such as these may explain why some individuals develop dependency on AOD while others in similar situations do not.

The Psycho-dynamic Model

This model proposes that substance use may be due to an unintentional response to some difficulties that an individual experienced in their childhood. This explanation is based on the theory that was put forward by Sigmund Freud, whereby the problems of whether we are able to cope with difficulties as adults are linked to our childhood experience. Many counselling approaches today are based on this theory which aim to seek understanding of people’s unconscious motivations and to enhance how they view themselves (Capuzzi & Stauffer, 2020).

The Psycho-dynamtic model also believes that AOD use is often secondary to a primary psychological issue. In other words, alcohol and other drugs is a symptom rather than a disorder, and AOD use is a means to temporarily relieve or numb emotional pain. For example, an individual suffering from depression might self-medicate with stimulants to relieve the enervating effects of depression or manage their anxiety by using benzodiazepines (Fisher & Harrison, 2017). 

There is evidence to support this model, whereby childhood traumatic events are associated with mental health problems and substance use disorders. Wu et al. (2010) conducted a study among 402 adults who were receiving substance use disorder treatments. They revealed that almost all (95%) of the participants experienced one or more childhood traumatic events, and 65.9% of them experienced emotional abuse and neglect from their childhood. The authors also reported that the higher the number of childhood traumatic events experienced, the higher the risk of substance use disorders and mental health problems such as post-traumatic stress disorder. 

Personality Traits

Some theorists suggest that certain individuals have certain personality traits that are linked to AOD dependency. For example, dependency on alcohol has been associated with traits such as developmental immaturity, impulsivity, high reactivity and emotionality, impatience, intolerance, and inability to express emotions (Capuzzi & Stauffer, 2020).

Social Learning Model

This model suggests that social learning processes such as observing other peoples behaviours (i.e., modelling) and cultural norms are important in the process of learning behaviours. Albert Bandura proposed Social Learning Theory which would argue that substance use is initiated by environmental stressors or modelling people around you with “perceived status”. For example, a child observes their parents use alcohol in social situations and the child is therefore more likely to perceive that AOD use for social situations is appropriate (Harrison & Fisher, 2017); the association between socialisation and alcohol has been established.

The social learning model also recognises the influence of cognitive processes such as coping, self-efficacy, and outcome expectancies. Some researchers are currently focusing on how an individuals expectation of the effects of drugs influence the pattern of AOD use and resulting dependency. Russell (1976, cited in Wise & Koob, 2013) suggested that dependency on substance is not only chemical (biological) but also behavioural and social in nature. 

It has also been suggested that substance use occurs when an individual thinks substance use is a coping mechanism. This can be learned from television and film, social medial, peer influence, or messages from caregivers during childhood. The individual hopes the AOD use will relieve from them from stress (Stevens & Smith, 2014). 

Socio-cultural Model

Different from the previous models, the socio-cultural model perceives substance use as an issue of society as a whole instead of focusing only on the individual. People tend to overestimate the influence of internal and psychological factors while underestimating the external and environmental factors, even among some alcohol and other drugs workers (Gladwell, 2000, cited in Lewis, Dana, & Blevins, 2015). Thus, this model highlights the importance of how society shapes substance use behaviours, such as cultural attitudes, peer pressures, family structures, economic factors, and more (Bobo & Husten, 2000). For example, Coffelt et al. (2006) found that parents’ alcohol use are associated with their children’s drinking behaviour, whereby when the adult’s alcohol problems increased, the likelihood of their adolescent child’s alcohol use increased. 

The Biopsychosocial Model

Substance use behaviour cannot be explained or understood scientifically or spiritually based on a single variable, antecedent, or “cause”. Biological, psychological, learning, social and cultural context all contributes to explaining why addiction develops and maintains. The interactions between these factors are presented in The Biopsychosocial Model – arguably the most commonly used model to explain addiction today. The model suggests that substance use and the progression of substance dependency can be explained by recognising that the body and mind are connected within a social and cultural context (Skewes & Gonzalez, 2013).

The model allows any combination of biological, psychological, social and cultural factors to contribute to AOD misuse and dependency, rather than a single dominating factor. This is much more holistic and integrative when attempting to understand the determinant of addiction (Stevens & Smith, 2014).

References:

1. Bobo, J. K., & Husten, C. (2000). Sociocultural influences on smoking and drinking. Alcohol Research and Health, 24(4), 225-232. 
2. Capuzzi, D., & Stauffer, M. D., Sharpe, C. W. (2020). History and etiological models of addiction. In D. Capuzzi, & M. D. Stauffer (Eds.), Foundations of addictions counseling (pp. 1-22). Pearson Education.
3. Coffelt, N. L., Forehand, R., Olson, A. L., Jones, D. J., Gaffney, C. A., Zens, M. S. (2006). A longitudinal examination of the link between parent alcohol problems and youth drinking: The moderating roles of parent and child gender. Addictive Behaviours, 31, 4, 593-605. https://doi.org/10.1016/j.addbeh.2005.05.034 
4. DiClemente, C. C. (2018). Addiction and change: How addictions develop and addicted people recover. The Guilford Press.
5. Fisher, G. L., & Harrison, T. C. (2017). Substance abuse: Information for school counsellors, social workers, therapists, and counsellors. Pearson Education. 
6. Lassiter, P. S., & Spivey, M. S. (2018). Historical perspectives and the moral model. In P. S. Lassiter, & J. R. Culbreth (Eds.), Theory and practice of addiction counselling. (pp. 27-46). Sage Publications. 
7. Lewis, J. A., Dana, R. Q., & Blevins, G. A. (2015). Substance abuse counselling. Cengage Learning.
8. Skewes, M. C., & Gonzalez, V. M. (2013). The biopsychosocial model of addiction. In P. M. Miller, A. W. Blume, D. J. Kavanagh, K. M. Kampman, M. E. Bates, M. E. Larimer, N. M. Petry, P. D. Witte, S. A. Ball (Eds.), Principles of addiction: Comprehensive addictive behaviours and disorders (pp. 61-70). Academic Press.
9. Stevens, P., & Smith, R. L. (2014). Substance abuse counselling: Theory and practice. Pearson Education. 
10. Teesson, M., Hall, W., Proudfoot, & Degenhardt, L. (2012). Addictions. Taylor & Francis Group.
11. Thombs, D. L., & Osborn, C. J. (2019). Introduction to addictive behaviours. The Guilford Press. 
12. Wise, R. A., & Koob, G. F. (2013). The development and maintainance of drug addiction. Neuropsychopharmacology, 39, 254-262.
13. Wu, N. S., Schairer. L. C., Dellor, E., & Grella, C. (2010). Childhood trauma and health outcomes in adults with comorbid substance abuse and mental health disorders. Addictive Behaviors, 35(1). 68-71. https://doi.org/10.1016/j.addbeh.2009.09.003 

Introduction

There is a moment in therapy that many practitioners recognise — the moment a client says something like, “Part of me wants to leave the relationship, but another part is terrified of being alone,” or “I know I shouldn’t be so hard on myself, but I can’t seem to stop.” These are not signs of ambivalence or contradiction. They are the natural language of a mind that is, at its core, multiple.

Internal Family Systems (IFS) therapy, developed by American psychotherapist Richard Schwartz in the 1980s, offers a sophisticated, compassionate framework for understanding this inner multiplicity. Rather than treating internal conflict as pathology or weakness, IFS recognises that the human psyche is composed of distinct “parts” — each with its own perspective, feelings, motivations, and history. Far from being a burden, this internal family can become, through careful therapeutic work, a source of extraordinary resilience and self-understanding.

This article explores IFS therapy in depth: its theoretical foundations, its core concepts, how it aligns with and enriches other established therapeutic approaches, and why working with parts has become one of the most generative developments in contemporary psychotherapy.

The Architecture of the Inner World: Core IFS Concepts

The Self

At the heart of IFS is the concept of the Self — a capital-S, differentiated Self that is not a part but rather the core of who we are. Schwartz describes Self as characterised by what he calls the “Eight Cs”: curiosity, calm, clarity, compassion, confidence, creativity, courage, and connectedness. In a well-functioning psyche, Self leads the internal system with warmth and wisdom, much as a skilled and attuned parent might lead a family.

Crucially, IFS holds that Self is never damaged, even in the most traumatised individuals. It may be buried beneath layers of protective activity, but it is always there — always intact, always available. This is a radical and profoundly hopeful premise, and one that resonates deeply with strengths-based and person-centred traditions.

The Parts

IFS identifies three broad categories of parts:

Exiles are the youngest, most vulnerable parts of the psyche. They carry the emotional weight of painful past experiences — shame, grief, terror, humiliation, abandonment, worthlessness. Exiles are often frozen in the moment of the original wound, experiencing distress as though it is happening right now. Because their pain is so intense, the rest of the internal system works hard to keep them hidden, suppressed, and out of conscious awareness. The system exiles them to protect the individual from being overwhelmed.

Managers are the proactive protectors — the parts that work day-to-day to keep exiles contained and maintain a functional life. They might appear as the inner critic who drives someone to perfectionism, the hypervigilant part that constantly scans for danger, the pleaser who never says no, the workaholic who stays perpetually busy, or the intellectualiser who processes everything through logic to avoid feeling. Managers are often the parts clients first present with in therapy. They can be harsh, relentless, and deeply self-critical — but they are acting out of care. They are trying to prevent the exile’s pain from surfacing and disrupting the person’s life.

Firefighters are the reactive protectors who spring into action when an exile’s pain does break through — when a trigger cuts past the managers’ defences. Their methods are urgent and often extreme: dissociation, substance use, bingeing, self-harm, rage, sexual compulsion, suicidal ideation. Like emergency workers who will break down a door to stop a fire, firefighters care little for collateral damage. They want the pain stopped, now. What might look from the outside like destructive or self-defeating behaviour is, from the inside, a desperate act of protection.

The Burden

IFS introduces the concept of burdens — the extreme beliefs, emotions, and somatic experiences that parts carry as a result of trauma or adverse experience. A part might carry the burden of worthlessness, of being too much, of being fundamentally unlovable, of needing to be perfect to be safe. Burdens are not intrinsic to the part — they were taken on, often in childhood, and can be released through therapeutic work. This process, known as unburdening, is one of the most moving and clinically significant moments in IFS therapy.

The Therapeutic Process: Accessing Self-Leadership

From Pathologising to Curious Partnership

One of the most significant shifts IFS invites is a fundamental change in how clients — and therapists — relate to symptoms. Rather than treating, suppressing, or pathologising parts, IFS invites clients to approach them with curiosity and genuine interest. What is this part trying to do for me? What is it afraid would happen if it stopped? This shift transforms the therapeutic relationship with internal experience from adversarial to collaborative.

This is deeply congruent with person-centred therapy as developed by Carl Rogers. The Rogerian conditions of unconditional positive regard, empathy, and congruence are, in IFS, extended inward — the client is invited to offer those same conditions to their own parts. The therapist models and facilitates an attitude of deep, non-judgmental curiosity toward even the most frightening or destructive-seeming aspects of the client’s inner world.

The U-Turn

IFS uses the evocative phrase “the U-turn” to describe the core therapeutic movement: from focusing attention outward (on external people, situations, or events) to turning inward and attending to one’s own parts. This is not a withdrawal from relationship, but a deepening of internal attunement that ultimately enriches external relating.

Working with Protectors First

A key technical principle in IFS is that therapists never attempt to work directly with exiles until protective parts have been acknowledged, understood, and have given permission. Attempting to bypass protectors — to push clients toward vulnerable material before the system is ready — risks overwhelming the client, reinforcing the protectors’ sense that they need to work harder, and potentially retraumatising.

This principle reflects trauma-informed care at a systemic level. Trauma-informed practice recognises that what looks like resistance is actually protection, that the body and mind have wisdom in their defensive responses, and that safety must precede exploration. In IFS, the therapist earns the trust of the protective system before asking it to step aside — and this is done with patience, respect, and genuine appreciation for the parts’ efforts.

IFS and Attachment Theory: The Inner Attachment System

Attachment theory, originally articulated by John Bowlby and extended by Mary Ainsworth and many others, holds that human beings are biologically wired for connection, and that the patterns of early caregiving relationships shape our internal working models of self and other. These models — secure, anxious, avoidant, disorganised — become templates for how we relate to ourselves and others throughout life.

IFS offers a compelling lens through which to understand these attachment patterns. A child who learned that their caregivers were unreliable or frightening may have a manager who vigilantly monitors others for signs of abandonment, and a firefighter who withdraws or rages when attachment fears are triggered. The exile at the centre of this system carries the original wound: the devastating belief that they are too much, not enough, or fundamentally unworthy of consistent love.

From an IFS perspective, insecure attachment patterns can be understood as the elaborate protective architecture built around early attachment wounds. The work of therapy is not simply to provide a corrective relational experience with the therapist (though this is important), but to help the client develop a secure relationship with their own internal system — to become, in a sense, a reliable and loving parent to their own parts.

This resonates with the concept in attachment theory of earned security — the idea that adults can develop secure attachment through reflective, attuned relationships, including therapeutic ones. In IFS, the therapeutic relationship with the Self becomes a primary vehicle for this.

IFS and Emotionally Focused Therapy: Accessing Primary Emotion

Emotionally Focused Therapy (EFT), developed by Sue Johnson and Les Greenberg, centres on accessing and transforming primary emotional experience as the key to therapeutic change. EFT identifies how people become trapped in negative interactional cycles — often driven by underlying attachment fears and needs — and works to create new, corrective emotional experiences within the therapeutic relationship or within close partnerships.

There is rich conceptual overlap between EFT and IFS. Both approaches recognise that:

• The emotional reactions clients present with (often described in EFT as “secondary” or “instrumental” emotions) frequently protect against deeper, more vulnerable primary emotions.
• Accessing and expressing primary emotional experience, in the context of an attuned, validating relationship, is transformative.
• Defensive strategies and relational patterns make sense in the context of their developmental origins.

In IFS terms, the secondary reactive emotions — anger, contempt, numbness — are often the expressions of firefighter or manager parts, while the primary vulnerable emotions — terror, grief, shame — belong to the exiles. The EFT therapist and the IFS therapist are, in a meaningful sense, working toward the same goal: creating conditions in which the most vulnerable inner experience can be safely accessed, expressed, and received.

For practitioners integrating both models, EFT’s attention to the intersubjective, relational dimension of emotional experience complements IFS’s detailed intrapsychic map beautifully.

IFS and Trauma-Informed Care: Parts as Survivors

Modern trauma theory — shaped by figures including Bessel van der Kolk, Peter Levine, Judith Herman, and Pat Ogden — has fundamentally reframed our understanding of traumatic experience and its sequelae. Trauma is understood not as a historical event but as an unresolved physiological and psychological response that continues to shape perception, behaviour, and relationship in the present.

IFS is inherently and deeply trauma-informed. Several key principles align precisely:

Safety first. IFS protocol requires establishing safety with protective parts before approaching wounded exiles — this is trauma-informed practice enacted at a structural level.

Symptoms as adaptations. IFS reframes all parts, including those that drive the most problematic symptoms, as adaptive responses to overwhelming experience. This directly mirrors trauma-informed care’s understanding of symptoms as the body and mind’s best attempts to survive.

The body as part. IFS readily integrates with somatic approaches, recognising that parts often manifest in the body — the tight chest of a manager, the hollow ache of an exile, the rush of adrenaline of a firefighter. This aligns with Levine’s Somatic Experiencing and Ogden’s Sensorimotor Psychotherapy, which understand trauma as fundamentally embodied.

Avoiding retraumatisation. The IFS approach of never forcing or bypassing protective systems directly addresses the risk of retraumatisation that is central to trauma-informed care. The system is never pushed faster than it is ready to go.

Van der Kolk has noted in his own work that IFS offers one of the most effective frameworks for trauma therapy available, precisely because it honours the adaptive intelligence of the traumatised system while providing a clear pathway toward healing.

IFS and Strengths-Based Practice: The Innate Wisdom of Parts

Strengths-based approaches in psychology — drawing on positive psychology, solution-focused therapy, and narrative traditions — begin from the premise that clients possess inherent resources, capacities, and competencies that can be identified and amplified in service of wellbeing and change.

IFS is, at its core, profoundly strengths-based. Consider:

• Every part, no matter how destructive its behaviour appears, is motivated by positive intent. The self-critical manager wants the client to be safe. The dissociating firefighter wants the client to survive. The exile, once unburdened, reveals not just pain but also energy, creativity, vitality, and joy.
• The Self is understood as inherently healthy, wise, and compassionate — it is never broken, never the problem.
• The goal of IFS is not to eliminate or control parts but to help them transform — to release their burdens and step into new, more constructive roles. Former managers may become trusted advisors; former firefighters may channel their protective energy more skillfully.

This sits comfortably alongside narrative therapy, which invites clients to identify their own preferred stories, values, and competencies, and to recognise that the problem is never the person — a belief IFS would extend to say that the problem is not even the part, but the burden the part carries.

Parts in the Consulting Room: Clinical Applications

The Inner Critic

One of the most common — and most clinically challenging — experiences clients bring to therapy is the inner critic: the harsh, often relentless internal voice that judges, shames, and attacks. Many therapeutic approaches attempt to challenge, reframe, or quieten this voice.

IFS invites a different approach: curiosity. What is this part trying to do? What is it afraid would happen if it stopped criticising? Almost invariably, the inner critic is a manager whose attacks are preemptive — better for me to shame myself than for others to shame me; better for me to be hard on myself than to become complacent and fail. Underneath the critic, there is almost always an exile who already feels deeply ashamed, and a fear that without constant vigilance, that exile’s shame would engulf everything.

When clients can approach the inner critic with curiosity rather than reactivity or resignation, something remarkable often happens: the critic softens. It is, at last, being seen. Its genuine care — however misguided its methods — is being acknowledged.

Polarised Parts

Clients frequently present with two parts in fierce opposition: the part that wants to leave a relationship and the part that is terrified to; the part that wants to rest and the part that drives relentlessly; the part that rages and the part that pleases. IFS understands these polarisations as a natural consequence of the parts system — each part pushes harder against the other in a bid to be heard, and the client gets caught in the middle, exhausted and immobilised.

The therapeutic work is not to choose a side but to witness and appreciate both parts, understanding what each is protecting and what burden each carries. When both parts feel genuinely heard — often, for the first time — they can begin to negotiate rather than fight, and a new, more integrated path often emerges organically.

Parts in the Body

Working somatically with parts is a natural extension of IFS practice. Clients are often invited to locate a part in the body — Where do you feel that manager? Where is the exile? — and to attend to it with curiosity. This somatic dimension both deepens access to parts and creates a felt, embodied quality to healing that purely cognitive work cannot achieve.

This reflects the insights of Sensorimotor Psychotherapy and somatic trauma work: that the body holds experience, and that healing requires the body’s participation, not just the mind’s.

The Therapist’s Parts: Working from Self

IFS has a distinctive and valuable contribution to make to therapist reflective practice. The model recognises that therapists, too, have parts — parts that may be activated by particular clients, content, or dynamics. A therapist’s rescuer part might want to fix a client’s pain. A manager part might become anxious in the presence of a client’s rage. A part carrying shame might be triggered by a client’s self-loathing.

IFS invites therapists to develop the same kind of Self-to-part relationship within themselves that they facilitate in clients. The goal is to work predominantly from Self — from that grounded, curious, compassionate centre — rather than from reactive parts. This is what makes authentic, attuned presence possible, and it is what clients most fundamentally need.

This resonates with concepts from relational psychoanalysis and interpersonal neurobiology around the therapist’s own embodied presence, attunement, and regulatory capacity as central to therapeutic change.

What the Research Tells Us

IFS has been formally recognised by the US Substance Abuse and Mental Health Services Administration (SAMHSA) as an evidence-based practice. Emerging research supports its effectiveness across a range of presentations including depression, anxiety, trauma symptoms, relationship distress, and chronic pain. Qualitative research consistently highlights clients’ experience of increased self-compassion, reduced internal conflict, and a greater sense of agency and coherence.

It is worth noting that the mechanisms of change in IFS (i.e., accessing and processing primary emotion, developing self-compassion, resolving internal conflict, processing traumatic memory) align with well-established change processes across multiple modalities. IFS does not work in spite of other evidence-based frameworks; it works, in significant part, because of the same underlying processes.

A Note on Integration

IFS is perhaps best understood not as a standalone modality but as a rich, generative framework that deepens and organises other therapeutic approaches. It sits comfortably alongside Acceptance and Commitment Therapy (whose defusion techniques offer another pathway to working with parts), Schema Therapy (whose modes bear striking resemblance to IFS parts), EMDR (which can be powerfully integrated with IFS for trauma processing), and Compassion Focused Therapy (which shares IFS’s emphasis on developing compassionate self-relationship).

For practitioners working across multiple frameworks, IFS offers what might be called a meta-map — a way of understanding the internal landscape that gives shape and direction to interventions drawn from many sources.

Conclusion: The Courage to Go Inside

Ultimately, IFS therapy is an invitation to curiosity over judgement, to compassion over shame, to relationship over exile. It asks clients to do something both simple and profoundly courageous: to turn toward their own inner world with the same warmth and interest they might offer a dear friend.

The parts of us that cause us the most distress are rarely our enemies. They are, more often, the oldest and most loyal parts of ourselves — still working, long after the need has passed, from strategies learned in more dangerous times. When we can see them clearly, appreciate their efforts, and help them lay down their burdens, what emerges is not fragmentation but wholeness: a richer, more spacious sense of self, capable of greater authenticity, deeper connection, and genuine wellbeing.

This article is intended for professional and educational purposes. If you are interested in exploring IFS-informed therapy for yourself, please speak with a qualified mental health practitioner.

Abstract

Addiction is a complex, multifaceted phenomenon that has been described variously as a disease, disorder, syndrome, obsessive-compulsive behaviour, learned behaviour, or spiritual malady. Modern scientific understanding emphasises addiction as a chronic brain disorder shaped by neurobiological changes, learning, and social context. This article examines each conceptualisation and presents an integrated definition that aligns with current neuroscience, psychological, and public health evidence.

Conceptualising Addiction: Labels and Their Accuracy

No single label fully captures addiction’s complexity; each highlights certain truths while overlooking others.

Disease

From a medical perspective, disease is the closest match. Addiction involves persistent neurobiological changes in reward, stress, and self-control circuits, increases relapse risk over years, and shows substantial genetic vulnerability (~50–60%) (NIDA, 2018; Heilig et al., 2021). Treatments improve outcomes but rarely “cure” the condition. This framing is used by the American Society of Addiction Medicine (ASAM), NIDA, WHO ICD-11, and DSM-5-TR (as “Substance Use Disorder”) (NIDA, 2018).

Disorder

Disorder is also scientifically accurate and slightly less medicalised. DSM-5’s “Substance Use Disorder” captures behavioural, psychological, and biological criteria and recognises functioning and harm rather than framing addiction strictly as a lifelong disease (Heather, n.d.; Heilig et al., 2021).

Syndrome

Addiction may be described as a syndrome because it is a cluster of symptoms with behavioural and physiological manifestations, without a single causative factor. However, the term is too generic for practical use outside clinical texts (Blithikioti et al., 2025).

Obsessive and Compulsive Learned Behaviour

Addiction involves learning, habit formation, and compulsion through reinforcement of rewarding behaviours (Hyman, 2005; Hausotter, 2013). Yet describing it solely as learned behaviour ignores genetic predisposition, neuroadaptation, withdrawal, and social factors.

Spiritual Malady

Some mutual-aid traditions characterise addiction as a spiritual malady. While this may be meaningful for individuals, it is not scientifically explanatory: addiction can be adequately explained via biological, psychological, and social mechanisms (Lewis, 2017).

Modern Integrative Definition

The most accurate contemporary description of addiction is:
“A chronic, relapsing disorder of brain circuits involved in reward, stress, and self-control, shaped by learning, environment, and social context”.

This definition encompasses:

• Disease/disorder: medical accuracy
• Learned behaviour and compulsion: neuroscience and behavioural accuracy
• Social determinants: public health relevance
• Flexibility for personal or spiritual interpretations

In short, addiction is best understood as a bio-psycho-social condition that is treatable and sometimes reversible, rather than a deterministic, lifelong curse.

Neurobiology: Why Addiction Is Considered a Brain Disorder

Repeated substance use alters structural and functional brain circuits involved in reward, stress, motivation, memory, and self-control (Nwonu et al., 2022; NIDA, 2018). These changes can persist long after use stops, explaining why addiction is more than a matter of “bad habits” or weak will (NIDA, 2025).

Chronicity and Relapse

Addiction is often chronic and relapsing. Even after long periods of abstinence, cues and stressors can trigger relapse (Meurk et al., 2014; SAMHSA, 2023). Key regions implicated include the basal ganglia (habit formation), extended amygdala (stress), and prefrontal cortex (decision-making) (Kirby et al., 2024). Nevertheless, many individuals achieve stable remission, highlighting heterogeneity in clinical outcomes (Heilig et al., 2021).

Learning, Memory, and Habit Formation

Addiction exploits neural mechanisms of learning and memory: rewarding behaviours are repeated and consolidated into habits, with cues triggering compulsive responses even when the substance’s reward diminishes (Hausotter, 2013; Lewis, 2017). This intertwines biological disorder and learned behaviour.

Critiques and Limitations

Some scientists caution that framing addiction strictly as a brain disease is simplistic:

• Brain changes may resemble those from other motivated behaviours (Lewis, 2017).
• Many recover without formal treatment (Heilig et al., 2021).
• Social, environmental, and psychological factors are crucial to understanding addiction (Blithikioti et al., 2025).

Thus, while the disease model is powerful, it does not fully represent addiction’s heterogeneity or socio-psychological dimensions.

Implications for Treatment

Addiction is treatable, not simply curable. Interventions combining pharmacological and behavioural approaches, alongside social support, can foster long-term recovery (Liu & Li, 2018; Heilig et al., 2021). Like other chronic conditions, management — rather than elimination — is often the realistic goal (NIDA, 2018). Neural circuits can gradually readjust, particularly when environmental and personal factors support recovery.

Conclusion

Addiction is a learned, compulsive brain disorder with chronic potential, shaped by neurobiological, psychological, social, and environmental factors. Recognising addiction as both a disorder and a behavioural learning condition avoids extremes: it is neither an unchangeable fate nor merely a moral failing. This integrated perspective supports nuanced understanding, compassionate care, and effective treatment strategies.

References

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