What Is Codependency? Why We Lose Ourselves in Relationships

Codependency is a pattern of relating in which one person consistently puts another’s needs, feelings and wants ahead of their own, until they start to lose touch with what they need themselves. It is the word people often reach for when a relationship feels one-sided, draining, or somehow off, without quite being able to say why. And it is less about loving too much than about slowly disappearing inside a relationship.

It is worth saying early on that codependency is not a formal diagnosis. You will not find it in the manuals psychiatrists use, and there is no single agreed definition of it. It is a description rather than a disorder. That does not make it any less real to the people living it, and it is something we see often. If you recognise yourself in this article, professional support for codependency can help you understand the pattern and begin to loosen its grip.

What is codependency?

Codependency means your sense of being okay depends heavily on someone else. You manage their moods, anticipate their needs and keep the peace, often at real cost to yourself. Over time, the relationship organises itself around one person, and the other quietly recedes.

The term came out of the addiction recovery world in the 1970s and 80s, where it first described the partners of people with alcohol problems, the ones doing the covering, the smoothing over and the rescuing. It has since broadened to describe almost any relationship in which someone over-functions for another person and loses themselves in the process. That broadening is part of why the word is now used so loosely, and why it means slightly different things to different people.

What codependency is not is simple kindness, generosity or commitment. Caring deeply about someone is healthy. The question is whether you still exist in the relationship too, or whether looking after them has quietly replaced looking after yourself.

What does losing yourself in a relationship look like?

Losing yourself tends to start subtly and build. You become the easy one, the accommodating one, the person who always says yes. On the surface this can look like a very functional relationship, because you rarely make demands and rarely cause friction. Underneath, something is being stored up.

I see this pattern often in the therapy room. People describe putting every one of their own needs to one side, for so long that they can no longer name what they actually want. They have become fluent in someone else’s preferences and gone quiet on their own. What tends to happen in the long run is resentment, sometimes a great deal of it, and relationships that fall apart precisely because one person was never really in them as themselves.

This loss of self is not just a feeling. A study of people who identify as codependent found that a lack of any clear sense of self, alongside a long-standing pattern of emotional and relational imbalance, was one of the defining features of how they described the experience.

“So many people lose themselves in a relationship through the desperation of wanting to be loved, rather than simply enjoying being loved. And once someone has abandoned themselves in a relationship, it always catches up with them.”

Dr Becky Spelman

This kind of automatic accommodating is not weakness, and it is rarely a conscious choice. For many people it began as a fawn response, a way of staying safe by keeping others happy, learned long before the current relationship began.

How is this different from simply being kind or generous?

The difference is whether the giving is free or compelled. In a balanced relationship you give because you want to, and you can stop without fear. When you have lost yourself, giving is driven by anxiety, and stopping feels dangerous.

Where does codependency come from?

Codependency is usually learned, and usually learned early. Many people who recognise it in themselves grew up in homes where love felt conditional, where a parent was unwell or unpredictable, or where being good, quiet and helpful was the safest way to be. A child who learns that other people’s feelings are their responsibility often carries that lesson straight into adulthood.

Our earliest relationships shape what closeness feels like and what we expect from it, which is why our early attachment patterns matter so much here. That said, there is no single origin story. Not everyone who becomes codependent had a difficult childhood, and not everyone with a difficult childhood becomes codependent.

What does the science actually show?

The honest answer is that the evidence is real but modest, and it does not support treating codependency as a fixed medical condition. One of the most useful studies here is an Irish one. Research carried out at University College Dublin by Cullen and Carr challenged a common assumption. People who scored high for codependency more often reported difficulties in their family of origin and a parent with mental health problems. But they did not report more parental alcohol or drug problems, and they did not report more childhood abuse. So the neat story that codependency always comes from growing up with an addicted parent simply does not hold.

A more recent review by Molina and colleagues, published in 2026, looked across the wider research and reached a similar sort of conclusion: codependency is a contested, fragmented idea, used to mean many different things. Even so, the studies consistently associate it with emotional distress, a disrupted sense of who you are, and difficulty in relationships. In other words, the label is messy, but the suffering it points to is not.

Taken together, the research suggests a genuine and painful relational pattern, often tied to early experience and to low self-worth, with no single cause and no need to over-medicalise it. That matters, because how you understand the problem shapes how you go about changing it.

Is codependency a recognised mental health diagnosis?

No. Codependency does not appear in the diagnostic manuals that psychiatrists and psychologists use, and there is no single agreed definition of it. It is best understood as a widely recognised description of a relational pattern, not a formal condition. That is not a reason to dismiss it. It simply means that good help focuses on the specific difficulties underneath it, such as low self-worth, anxiety, or the effects of a difficult upbringing, rather than on treating a diagnosis.

How does codependency overlap with ADHD and autism?

Codependent patterns often show up alongside ADHD and autism, though neither condition causes codependency, and the overlap is easy to misread. The evidence directly connecting them is still limited, so the point here is practical rather than diagnostic: understanding which is which can change what actually helps.

How are codependency and ADHD connected?

For people with ADHD, the link tends to run through rejection sensitivity. Research on adults with ADHD, including a 2022 study by Beaton and colleagues, has documented how intensely some people experience criticism and perceived rejection, to the point of shaping their behaviour around avoiding it. That can look a great deal like codependency: chronic people-pleasing, over-apologising, and struggling to hold a boundary because the discomfort of disappointing someone feels unbearable. If this resonates, an ADHD assessment can help clarify what is driving the pattern.

Is autistic masking the same as codependency?

Not quite, though they can look almost identical from the outside. Many autistic adults describe suppressing their own responses and closely monitoring other people in order to stay safe socially, which sits very close to the self-abandonment described here. Late diagnosis can mean years of accommodating others before anyone understands why. But masking is a response to a world that has not made room for you, rather than a relational pattern in its own right, and it is important not to collapse the two. Support around autism starts from that distinction.

If you are not sure whether a neurodevelopmental difference, a relational pattern, or both are at play, a psychiatric assessment can help untangle what is actually going on before you decide what to work on.

Why doesn’t “just set boundaries” work?

Because the problem was never that you did not know you should. Most advice on codependency assumes the difficulty is a lack of knowledge, and offers a list: say no, prioritise yourself, set boundaries. If it were that simple, you would have done it already.

The real difficulty is tolerating how it feels to say no when part of you learned, long ago, that other people’s approval is what keeps you safe. Setting a boundary is not just a decision. It can bring a wave of guilt and anxiety that feels almost physical, and the fastest way to make that feeling stop is to give in. So you give in, and the pattern holds.

What actually helps with codependency?

What helps is slower and deeper than a list of rules. Therapy works on noticing the pattern as it happens, staying with the discomfort that follows a boundary instead of immediately undoing it, and rebuilding a sense of self-worth that does not depend on someone else’s mood. It also means learning the real difference between supporting another adult and feeling responsible for them. That is why coping strategies on their own so rarely hold, and why the change, when it comes, tends to be steadier.

How we can help you find your way back

If any of this feels familiar, it is worth knowing that codependent patterns can change, even ones that have been in place for decades. The work is not about becoming harder or caring less. It is about coming back to yourself, so that you can be close to someone without disappearing into them. Our therapists offer therapy for codependency that looks at where the pattern came from and what keeps it going, and, where the relationship itself has become difficult, at what is happening between you and the other person too.

A good first step is simply to talk it through with someone. We offer a free 15-minute consultation so you can ask questions, get a feel for how we work, and think about what the right kind of support might look like for you, with no pressure to commit to anything further.