Co-Dependency: A Nervous System Response to Trauma and Addiction Loops
Online, codependency is often simplified as “people with low self-esteem who people-please because of past trauma.”
While people-pleasing and trauma are frequently connected to codependency, the pattern has deeper and more nuanced roots and challenges.
One way to understand codependency is through the lens of addiction loops and the nervous system.
In this article, you’ll learn how codependency and trauma connect, why codependent relationship behavior can look like “helping” or “fixing,” and how therapy for codependency can help you heal.
If you’ve ever wondered why you stay in a toxic relationship, why you keep hoping the person you’re with will change, or why you go out of your way to help others with little return, this article will help you unpack those patterns and see how therapy can support real change.
What is Codependency?
Codependency is described when someone stays with a dysfunctional partner “to the extent of organizing one’s life around the presumed needs, interests, well-being, and good reputation of the partner, often at the expense of one’s own” Wright & Wright.
It is not a formal mental health diagnosis, but it is a useful term to understand patterns of behavior in unhealthy relationships.
Adaptive vs. Maladaptive Codependency
In healthy relationships, it’s normal to depend on each other, care for one another, and take the other person’s needs into account. Some researchers call this adaptive codependency: both people are respected and cared for mutually (Whitfield).
Maladaptive codependency, in contrast, often appears in toxic or unbalanced relationships.
Common Signs of Codependency
People with codependent patterns often:
Feel so enmeshed with their partner that they can’t define their own desires or feelings, to the point where it’s hard to make decisions for themselves.
Will default to someone else’s beliefs, even if they initially disagreed.
Have low self-worth, downplay their own skills, do not believe in their abilities.
Feel like they aren’t good enough to be in a relationship unless they over-give, fix, or constantly care for the other person.
From the outside, the relationship looks toxic because the partner engages in harmful behaviors such as substance use, alcoholism, or narcissistic dynamics.
The codependent may try to “fix” their partner, enable those behaviors, and work to prevent their partner from any accountability.
Many people with codependent patterns experienced childhood instability, an alcoholic or narcissistic parent, abandonment, or boundary violations. As a protective mechanism, codependency can function as an attempt to guard against future negative situations (Guan et al.).
Codependency and the effect of Dopamine, Oxytocin, and Addiction Loops
After an experience with abandonment, it can feel intensely rewarding to be needed. The sense of value and control that comes from caretaking can create a reinforced emotional cycle that resembles aspects of addiction.
Research suggests that the brain can trigger a dopamine response in a codependent individual when their partner needs them, because it feels like a reward.
Dopamine also thrives in a push-pull experience and will-they-won’t-they situations, much like a slot machine. Dopamine spikes in codependent relationships when a partner is cold and hurtful and then becomes emotionally close.
This feel-good response is mirrored when oxytocin comes in, intensifying the feeling that you need this person in order to feel at ease and complete (Canadian Centre for Addictions, Ermakov).
While dopamine and oxytocin are normal parts of healthy social bonding, those with codependency have had unhealthy pathways reinforced during childhood.
Oxytocin helps us to feel connected to others, but it can also override how we see negative social cues, such as aggression or emotional harm from a partner (Baskerville).
This is part of why you may feel like “I can’t leave my partner, their life will fall apart without me” and also “I can’t leave my partner, my life will fall apart without them.” You’re protecting yourself from a possible dopamine crash.
Codependency, the Brain & Nervous System
Based on the intense need to keep the relationship stable, a codependent’s nervous system is in an ongoing state of high alert.
Research shows an association between codependency and decreased activity in the prefrontal cortex of the brain.
This area of the brain regulates our emotions, helps us to enforce boundaries, and gives us confidence in decision making. A decreased activity here can explain why those who have codependent behavior find those tasks to be difficult (Zielinski et al.).
Codependency is often connected to anxious attachment. People with an anxious attachment style have a strong fear of abandonment, need frequent reassurance, and can walk on eggshells around their partner to prevent a negative mood. This attachment style overlaps with codependent patterns in the brain and helps explain the “can’t leave” feeling.
Healing Codependency with a Nervous System Based Therapeutic Approach
If you see yourself in these patterns, it helps to remember:
Codependency isn’t a character flaw.
Codependency is a protective response from your nervous system, to help you survive in a challenging environment.
Therapy can help you to understand the addiction loops that keep you stuck, and learn how to regulate your nervous system so you don’t need to rely on fixing others to feel calm.
Scientific research supports nervous-system based approaches like somatic therapy and EMDR. These methods:
Help you to shift away from survival-based patterns and learn more helpful, balanced behaviors
Connect past trauma with current behaviors so you can understand them better
Work with the brain directly in a way that’s different from talk therapy
Support neuroplasticity, so the brain can rewire its prefrontal cortex for better boundary setting, regulation, and self-determination.
As you process past trauma, you can start to feel more like yourself and build healthier relationships.
If you’re ready to make a change and improve your internal thought patterns, I invite you to set up a FREE 15-minute phone consultation.
Further Resources:
Finding Self-Worth After Being Raised by a Narcissist: A Therapist’s Perspective
Addiction and Your Attachment Style
How EMDR Therapy Can Treat Addiction
How Childhood Attachment Trauma Can Lead to Love Addiction
Hi, I’m Michele Ross, a Licensed Clinical Social Worker with over 25 years of experience helping individuals navigate addiction, relationship challenges, and past trauma. I believe lasting healing happens when people understand the emotional survival patterns behind their behaviors, and I offer compassionate, insight-oriented support to help clients build a stronger sense of self and more fulfilling relationships. Reach out today to schedule a consultation.
