Polyvagal Theory and Trauma – Dr. Stephen Porges

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

Blithikioti, C., Fried, E. I., Albanese, E., Field, M., & Cristea, I. A. (2025). Reevaluating the brain disease model of addiction. The Lancet Psychiatry, 12(6), 469–474. https://doi.org/10.1016/S2215-0366(25)00060-4

Hausotter, W. (2013). Neuroscience and understanding addiction. Addiction Technology Transfer Center (ATTC) Network. https://attcnetwork.org/neuroscience-and-understanding-addiction

Heather, N. (n.d.). What’s wrong with the brain disease model of addiction (BDMA)? Addiction Theory Network. https://addictiontheorynetwork.org/brain-disease-model-of-addiction

Heilig, M., MacKillop, J., Martinez, D., Rehm, J., Leggio, L., & Vanderschuren, L. J. M. J. (2021). Addiction as a brain disease revised: Why it still matters, and the need for consilience. Neuropsychopharmacology, 46(10), 1715–1723. https://doi.org/10.1038/s41386-020-00950-y

Hyman, S. E. (2005). Addiction: A disease of learning and memory. The American Journal of Psychiatry, 162(8), 1414–1422. https://doi.org/10.1176/appi.ajp.162.8.1414

Kirby, E. D., Glenn, M. J., Sandstrom, N. J., & Williams, C. L. (2024). Neurobiology of addiction (Section 14.5). In Introduction to Behavioral Neuroscience. OpenStax. https://socialsci.libretexts.org/…/14.05:_Neurobiology_of_Addiction

Leshner, A. I. (1997). Addiction is a brain disease, and it matters. Science, 278(5335), 45–47. https://doi.org/10.1126/science.278.5335.45

Lewis, M. (2017). Addiction and the brain: Development, not disease. Neuroethics, 10(1), 7–18. https://doi.org/10.1007/s12152-016-9293-4

Liu, J. F., & Li, J. X. (2018). Drug addiction: A curable mental disorder? Acta Pharmacologica Sinica, 39(12), 1823–1829. https://doi.org/10.1038/s41401-018-0180-x

Meurk, C., Carter, A., Partridge, B., Lucke, J., & Hall, W. (2014). How is acceptance of the brain disease model of addiction related to Australians’ attitudes towards addicted individuals and treatments for addiction? BMC Psychiatry, 14, 373. https://doi.org/10.1186/s12888-014-0373-x

National Institute on Drug Abuse. (2018). Drugs, brains, and behavior: The science of addiction (Rev. ed.). https://irp.nida.nih.gov/…/NIDA_DrugsBrainsAddiction

Nwonu, C. N. S., Nwonu, P. C., & Ude, R. A. (2022). Neurobiological underpinnings in drug addiction. West African Journal of Medicine, 39(6), 874–884. https://pubmed.ncbi.nlm.nih.gov/36063103

Substance Abuse and Mental Health Services Administration. (2023). What is substance use disorder? U.S. Department of Health and Human Services. https://www.samhsa.gov/substance-use/what-is-sud

Psychologists believe that the core issues of anorexia nervosa and bulimia nervosa are multifaceted, involving a combination of biological, psychological, and social factors. Here are some of the key issues:

Anorexia Nervosa

1. Distorted Body Image: Individuals with anorexia often have a distorted perception of their body size and shape, seeing themselves as overweight even when they are underweight.
2. Intense Fear of Gaining Weight: There is an overwhelming fear of gaining weight or becoming fat, which drives restrictive eating behaviors.
3. Control Issues: Anorexia can be a way for individuals to exert control over their lives, especially if they feel powerless in other areas.
4. Perfectionism: Many individuals with anorexia have perfectionistic tendencies, striving for an unattainable ideal of thinness.
5. Emotional Regulation: Restricting food intake can be a way to manage or numb difficult emotions and stress.

Bulimia Nervosa

1. Binge-Purge Cycle: Bulimia is characterized by cycles of binge eating followed by purging behaviors such as vomiting, excessive exercise, or misuse of laxatives.
2. Body Dissatisfaction: Similar to anorexia, individuals with bulimia often have a negative body image and are preoccupied with their weight and shape.
3. Impulsivity: Bulimia is often associated with impulsive behaviors and difficulties in regulating emotions.
4. Shame and Guilt: After binge eating, individuals with bulimia often feel intense shame and guilt, which perpetuates the cycle of purging3.
5. Co-occurring Mental Health Issues: Anxiety, depression, and other mental health disorders are commonly seen in individuals with bulimia.

Both disorders are complex and can have severe physical and psychological consequences. Treatment typically involves addressing these core issues through therapy, medical monitoring, nutritional counselling, and support groups.

Marsha Linehan, the creator of Dialectical Behavior Therapy, gives four options for any problem that you face: Solve the problem, change your perception of the problem, radically accept the situation, or stay miserable.

When we are overwhelmed by a life challenge, one way we might naturally respond is by defending our position. Perhaps, we’ll resort to an effective yet temporary coping strategy like denial, projection, victimhood, or blaming. We attempt to cope in ways that lessen the stress – the internal discomfort and unpleasantness. Coping strategies that offer temporary relief generally make the situation worse in the long run, especially when fostering relationships at work and in our personal lives. For example, crawling back into bed when you need to work or have commitments with friends. Maybe you over-eat, use chemicals or resent the world, which alleviates the immediate emotional pain, then feel guilty or ashamed afterward. 

Sometimes, in an effort to take action, people attempt to solve problems cognitively – problems that cannot be solved, becoming more and more frustrated when their efforts don’t work. Others become paralyzed or dissociate, unable to decide what to do. Intense emotions can be overwhelming, fatiguing, and compromise our ability to think with an open heart and a clear mind. Searching endlessly for the right solution adds to anxiety and distress.

Marsha Linehan, the creator of Dialectical Behavior Therapy, gives four options for any problem that you face: Solve the problem, change your perception of the problem, radically accept the situation, or stay miserable.

Choice 1: Solve the Problem.

There are many problem-solving strategies, but most use the same steps. First, define the problem. Be as specific as possible. Use numbers whenever possible. For example, “I’ve been late for work four days this week.”

Next, analyze the problem. Is it in your power to solve the problem? If not, then consider one of the other three options. If yes, then continue to analyze the problem.

What are the reasons you’ve been late? Is the reason always the same?  Does it depend on your mood or what time you went to bed? Does it depend on what tasks you have to do at work? Who you work with? Where you went the night before?  Consider the who, what, when, and where of the behavior you want to change.

The third step is to consider possible solutions. Think of various solutions that could solve the problem. Evaluate the solutions carefully to determine which might work best for you. What are the pros and cons of different actions? What could go wrong? What can you do to make the solution more likely to work?

For example, if you decide to give yourself a weekly budget and to freeze your credit cards in a block of ice, what would you do in case of an emergency? Would giving yourself a certain amount of spending money for the day work better than an amount for the week?

A key variable to remember is how difficult it is to make changes in behavior. A strong commitment to change is important. Be specific in stating the change you want to make. Be willing to make small changes at first. Implement the solution: Take action. Trouble-shoot as you go along, tweaking it to resolve any issues you didn’t anticipate.

Choice 2: Change Your Perception.

Changing your perception of the problem can be a challenge. An example of changing your perception of a problem might be to see a difficult boss as an opportunity to work on coping with someone who is disorganized and demanding. If you feel irritated because your house is cluttered with toys, maybe change your perception to one that the clutter is a signal to be grateful for young children in the home. Changing your perception could also mean changing your view of emotion. Instead of trying never to feel anger, look at your frustration as a source of information, perhaps a signal that you need to speak up for yourself.

Choice 3: Radically Accept the Situation.

Radical Acceptance means wholeheartedly accepting what is real. Radical acceptance is like saying, “It is what it is,” and giving up your resistance to the situation. Radical acceptance could be about issues we can’t control or concerns that we decide not to change, at least for the time being. It doesn’t mean you agree with what has happened or that you think it is reasonable.

Choice 4: Stay Miserable.

Of course, staying miserable is not a choice anyone wants to make, and no one would want to consider it as an option. But if you can’t solve the problem, can’t change your perception, and you aren’t ready to radically accept the situation, then staying miserable is the only option left.

Staying miserable may be all you can do in certain situations. Sometimes staying miserable may be what you have to do until you are ready to do something else. There are ways to cope that can help until another option can be used.

In future posts, we’ll look at specific skills that enhance your ability to problem-solve, change your perception, or radically accept situations. We’ll also consider ways to get through the times when you can’t make any of those choices.