Overview

Why does someone come to believe they are, or should become, the opposite sex? This is the question of aetiology: where gender distress comes from and why some people seek transition to resolve it. It is the most contested question in gender medicine, and the answer shapes everything downstream: whether distress is treated as a fixed fact to be affirmed or as a signal to be understood, and whether irreversible steps come before or after that understanding.

This hub brings together the pages on factors that detransitioners, clinicians and researchers often link to gender distress. They are organised into four groups:

• Autism: social difficulty, sensory differences and rigid thinking, and how they can be read as a gender problem.
• Internalised prejudice: absorbed shame about one's sexuality or sex, with sub-pages on internalised homophobia, internalised misogyny and internalised misandry.
• Trauma: abuse, assault, neglect and other adverse experiences.
• Mental health: depression, anxiety, OCD, identity disturbance and dissociation, with a sub-page on body dysmorphia and eating disorders.

Rather than repeat those pages, this hub explains how the factors fit together, how they cluster differently in different groups, and what the evidence can and cannot say about cause.

A multifactorial model

Clinicians in other areas of mental health often use a simple framework called the "4 Ps" formulation, which sorts the influences on a problem into four groups. It is a useful way to think about gender distress because it avoids the false choice between "born this way" and "caused by one thing".

• Predisposing factors: what makes a person vulnerable in the first place. Examples include autism and other neurodevelopmental differences, temperament, gender non-conformity in childhood, same-sex attraction growing up in a hostile environment, early trauma or neglect, and a family culture with rigid ideas about what boys and girls should be.
• Precipitating factors: what triggers the distress or the identity at a particular moment. Puberty is the most common, especially for girls. Others include sexual assault, bullying, a breakup, a depressive episode, first exposure to online gender content, or a friend coming out as trans (see social contagion and peer influence).
• Perpetuating factors: what keeps the distress going and locks the explanation in place. These include online communities that reinterpret all discomfort as dysphoria, social transition and new names that make doubt costly, the short-lived relief of hormones, and clinicians who affirm without exploring.
• Protective factors: what helps a person resolve distress without changing their body, such as a stable family, accepting gay and lesbian role models, exploratory therapy, physical activity, and time.

This framework fits the way many detransitioners describe their own histories after the fact. They rarely name a single cause. More often they describe several vulnerabilities that a trans identity seemed to explain all at once.

It's easy to attribute everything to this one thing, thats actually easier to do then to deal with the complexities that brought you to feeling this way. It's never just one thing, its many things working together to make someone feel this way. —TullipR, detrans male

That is the psychological appeal of a gender explanation. Depression, social isolation, body hatred, sexual shame and trauma are diffuse, hard to name and slow to treat. "I am trans" turns them into one problem with a clear, actionable solution. The mental health page calls the clinical version of this diagnostic overshadowing: once gender dysphoria is diagnosed, everything else is blamed on it.

The factors at a glance

How the factors interact

The factors rarely appear alone. In the Finnish case series of nine adult detransitioners, mood disorders were found in 89%, anxiety disorders in 78%, borderline personality disorder in 56% and eating disorders or symptoms in 78%, and childhood trauma or sexual abuse affected nearly all of them (Kettula et al. 2025). A study of a UK adult gender clinic found that neurodevelopmental conditions, adverse childhood experiences and mental health problems were each independently linked to poorer outcomes (Hall, Mitchell & Sachdeva 2021).

Some combinations come up again and again in detransitioners' accounts:

• Autism with internalised misogyny. An autistic girl who does not fit in with other girls and finds feminine social rules baffling may conclude she is "not really a girl". Intense interests can then attach to gender itself.
• Trauma with body hatred. A girl who was sexually assaulted may want to escape the body that was violated. Disgust at breasts and curves can look like dysphoria while working more like a trauma response or an eating disorder.
• Same-sex attraction with stereotypes. A feminine boy or masculine girl, teased for it and sensing they are gay before they can say so, may find "trans" easier to accept than "gay".
• Depression with escape. When life feels unbearable, becoming someone else can look like the only way out.

I'm autistic and trans identity and desire to be a man turned out to be a mix of body dysmorphia I've been struggling since I was a little girl, of autistic hyperfixation and some form of coping mechanism because of years of bullying, internalized misogyny and SA trauma. —thistle_ev, detrans female

This account shows why a single-factor explanation misleads in either direction. Each factor alone might have been survivable without a gender explanation. Together, and joined by a culture that offered transition as the answer to body hatred, they produced a trans identity that lasted years and led to a mastectomy.

Different paths in females and males

The factors do not cluster the same way in both sexes. Gender clinics in many countries have seen the patient group shift from mostly males to mostly adolescent girls, a reversal in the sex ratio that researchers have documented across clinics (Zucker 2017) and that is covered in more depth on the demographic shift page. Detransition samples follow the same pattern: 69% of Littman's 100 respondents were female (Littman 2021), as were 91% of the 78 young adults in a later survey (Littman et al. 2024).

Female presentations

In female detransition accounts, the recurring themes are internalised misogyny, sexual trauma, distress at female puberty, eating disorders, autism and same-sex attraction. In the 2024 survey, 43% of the female respondents were exclusively same-sex attracted, while none of the males were (Littman et al. 2024). The common thread in many of these stories is not a wish to become a man so much as a wish to stop being a woman: unsexualised, safe, taken seriously, free of stereotypes. The internalised misogyny page explores this in depth.

Male presentations

Male accounts more often involve same-sex attraction and feminine behaviour from childhood, shame about being male (internalised misandry), depression and social failure, autism, and in some cases autogynephilia and heavy pornography use. These threads can be hard to untangle, and men who describe autogynephilia often also describe deep shame about it.

I think a lot of the reason AGPs go through with it is the shame of being a man turned on by feminisation. … It's much easier to just "become the girl" and finally your sexuality makes sense with your gender. —krjrhrhrhewiheh, detrans male

For a gay man, the pressure can run differently: transition offers a way out of being a feminine gay man.

I thought I was trans because I was a feminine gay man, and being a straight woman would be a more desirable existence than being a feminine gay man. To a degree, I still think this, but I now realize that I was running away from something and not truly gender dysphoric. —Mountain-Bug-4865, desisted male

Early-onset, adolescent-onset and late-onset

Clinical researchers have long described at least two developmental pathways into gender dysphoria, distinguished by when the distress begins (Zucker 2019). A third, adolescent-onset pattern has become far more common in the last fifteen years.

The adolescent-onset group draws the most attention because it is the newest and the fastest-growing. A Finnish clinic team was among the first to report that many of the girls arriving at their service had "severe psychopathology" and wider problems with identity development (Kaltiala-Heino et al. 2015). Their later register study found that young people referred after 2010 had about double the pre-referral psychiatric morbidity of the earlier group (Ruuska et al. 2026). The debate over this pattern is covered on the rapid-onset gender dysphoria page.

Detransitioners themselves often point to timing as a warning sign:

The most obvious one is definitely if your "dysphoria" happens out of nowhere during puberty or adulthood, especially after traumatic or emotionally difficult events in your life. That is a BIG RED flag if you ask me. —Kirikizande, desisted female

Early onset is not a guarantee of anything either. Some detransitioners had cross-sex feelings from early childhood and still found that other factors were driving them:

I experienced gender dysphoria from age four. During grade school, I was unathletic and overweight, which made me the victim of frequent bullying and made me wish even more that I was a girl … At age 42 I was experiencing severe bouts of anger and was diagnosed with depression. … Then at age 44, I was diagnosed with autism, which finally brought the whole ordeal into focus. —OtterWithKids, detrans male

What about biology?

Some researchers and many trans people argue that gender identity has a biological basis, such as genes or prenatal hormone exposure. The evidence is inconclusive. A Swedish register study of twins found no concordance for gender dysphoria among same-sex twin pairs, which the authors read as evidence against a strong genetic effect (Karamanis et al. 2022). A 2025 Australian twin study that pooled data reached the opposite conclusion and reported evidence of a genetic contribution (Scientific Reports 2025). Neither study shows that a person can have an inborn identity of the opposite sex. See born in the wrong body for the brain-science claims.

Even if temperament or gender non-conformity is partly heritable, that does not settle the clinical question. A heritable trait such as non-conformity can still be interpreted in very different ways, as a variation in personality or as proof of being "really" the other sex, and that interpretation is shaped by culture, family, peers and clinicians.

Correlation is not causation

The research on this page is mostly about co-occurrence: autism, trauma and mental illness are far more common among people with gender distress. That does not show which way the arrow points, and honest discussion has to admit this.

• Reverse causation. The minority stress model holds that depression and anxiety in trans people are partly caused by stigma, rejection and living with untreated dysphoria. If so, some mental illness is a consequence of gender distress, not a cause.
• Shared vulnerability. A third factor, such as a neurodevelopmental difference, might independently raise the risk of both.
• Selection. Clinic samples over-represent people with complex needs, and detransitioner surveys recruit through online communities, so neither is representative.

The Finnish register data cut against a pure minority-stress explanation: gender-referred youth already had about three times the specialist psychiatric treatment of their peers before referral, and their psychiatric needs often rose rather than fell after medical transition (Ruuska et al. 2026). The mental health page sets out both explanations in detail. The practical conclusion the Cass Review drew does not depend on settling causation: co-occurring conditions must be assessed and treated in their own right, because medical transition does not treat autism, trauma or depression.

Trans objections to these frames

Many trans people object strongly to the "causes and correlates" framing. Their main objection is that it treats a trans identity as a symptom to be explained away, which they experience as pathologising and as an excuse to withhold care. Some have also had clinicians push these explanations on them.

ive had people say im just trans because im autistic or was abused as a child. both are true but like, ok? im autistic and traumatized, ive experienced gender dysphoria my whole life, and ive also experienced those two things my whole life. —welcomehomo, trans man (FTM)

Honestly, I wasn't SAd, but I had two therapists trying to convince me that I was transgender thanks to sexual trauma and they even asked my father for a SA that never happened. —Proper-Exit8459, trans man (FTM)

I showed signs of being trans long before my PTSD actually developed —Kermit1420, trans man (FTM)

These objections deserve a serious answer. A trauma history or an autism diagnosis does not prove that someone's distress "isn't real", and a clinician should not impose an explanation any more than they should impose a gender identity. The aim of exploring these factors is not to tell anyone who they are. It is to make sure that distress with several possible sources is understood before it is treated with permanent interventions. The real harm, as many detransitioners point out, comes from irreversible medical steps taken without that understanding. Gender exploratory therapy is built on this principle: open-ended exploration without a predetermined outcome either way.

How detransitioners explain their transitions

Detransitioners are the people best placed to look back and see what drove their transition, though hindsight brings its own biases. When asked why they transitioned, many on /r/detrans describe a pattern in which transition was a way out of something else.

Then when I sat down and mapped out why I wanted to transition. Everytime it was a bad time in my life and wanted to be someone else. —TheGrandTriangle, detrans male

I didn't experience gender dysphoria until I started getting to know people who had transitioned. People began describing dysphoria and I felt like I could relate. I didn't know it then but what I was actually experiencing was dissociation due to childhood trauma. —Ok-Parsnip4951, detrans male

Many also warn against swapping one single explanation for another:

I think one of the problems of the whole mess of trans is that there are a number of reasons but a tendency to homogenise and/or look for a singular "why." —GeneralistKitten, detrans female

A striking theme is that some discovered the link only by accident, when treating something else made the dysphoria fade:

Basically I accidentally discovered that I could make my dysphoria go away/heal by treating my past trauma, gender related hangups, sexual issues, general identity issues, etc, which I started doing just to work on my anxiety and stuff like that. Back then I had no idea my dysphoria was so connected to all my other issues. —Werevulvi, detrans female

What the surveys show

Three surveys give the best available numbers on how detransitioners explain their own transitions. All recruited online and are self-selected, so they describe these samples, not all detransitioners.

The surveys also show that detransitioners are not all alike. A typology by Expósito-Campos (2021) distinguishes "core" detransitioners, who re-identify with their sex, from "non-core" detransitioners, who stop transition for external reasons such as discrimination or health problems while still identifying as trans. Some people do detransition because of outside pressures, and those people are less represented on /r/detrans. The factors on this page mainly concern the core group. For the broader picture, see detransition, transition regret and the /r/detrans timeline statistics.

Why some people later reverse course is the subject of a companion section, why some people detransition. Many of the reasons described there are these same factors seen in hindsight, especially in reframing dysphoria.

Why it matters

Understanding why gender distress arises is not an academic exercise. If distress grows out of trauma, depression, an eating disorder, internalised homophobia or misogyny, then hormones and surgery treat the wrong thing, and can add permanent physical changes to the original problem. If it grows out of a combination, then careful assessment of each strand is the only way to know what will help.

That points to a few practical conclusions, which the child pages develop:

• Assess before acting. The Cass Review recommends that young people be screened for autism and mental health conditions and that these be treated in their own right.
• Treat the other conditions too. Trauma therapy, treatment for depression or an eating disorder, and support around sexuality can change how gender distress feels.
• Separate personality from sex. Gender non-conformity is not evidence of being the opposite sex. See gender non-conformity without labels and gender dysphoria.
• Allow time. In the largest follow-up of gender-referred boys, most no longer had gender dysphoria by adolescence or adulthood (Singh, Bradley & Zucker 2021), and many detransitioners describe distress that eased with maturity.

Support options, including exploratory therapists and detransition peer groups, are listed in the support directory. First-hand accounts are collected in the video archive, and the underlying research is in the study archive.

References

• Cass, H. (2024). Independent review of gender identity services for children and young people: Final report. study page, source.
• Expósito-Campos, P. (2021). A Typology of Gender Detransition and Its Implications for Healthcare Providers. study page, source.
• Hall, R., Mitchell, L. & Sachdeva, J. (2021). Access to care and frequency of detransition among a cohort discharged by a UK national adult gender identity clinic: retrospective case-note review. BJPsych Open. study page.
• Kaltiala-Heino, R., Sumia, M., Työläjärvi, M. & Lindberg, N. (2015). Two years of gender identity service for minors: overrepresentation of natal girls with severe problems in adolescent development. Child and Adolescent Psychiatry and Mental Health, 9, 9. source.
• Karamanis, G. et al. (2022). Gender dysphoria in twins: a register-based population study. Scientific Reports, 12. source.
• Kettula, K., Puustinen, N., Tynkkynen, L., Lempinen, L. & Tuisku, K. (2025). Gender Dysphoria and Detransitioning in Adults: An Analysis of Nine Patients from a Gender Identity Clinic from Finland. study page, source.
• Littman, L. (2021). Individuals Treated for Gender Dysphoria with Medical and/or Surgical Transition Who Subsequently Detransitioned: A Survey of 100 Detransitioners. study page, source.
• Littman, L., O'Malley, S., Kerschner, H. & Bailey, J. M. (2024). Detransition and Desistance Among Previously Trans-Identified Young Adults. Archives of Sexual Behavior. study page, source.
• Ruuska, S.-M. et al. (2026). Psychiatric Morbidity Among Adolescents and Young Adults Who Contacted Specialised Gender Identity Services in Finland in 1996–2019: A Register Study. study page, source.
• Scientific Reports (2025). Using twin data to examine heritable and intrauterine hormonal influences on transgender and gender diverse identities. source.
• Singh, D., Bradley, S. J. & Zucker, K. J. (2021). A Follow-Up Study of Boys With Gender Identity Disorder. Frontiers in Psychiatry. study page, source.
• Vandenbussche, E. (2022). Detransition-Related Needs and Support: A Cross-Sectional Online Survey. Journal of Homosexuality. study page, source.
• Zucker, K. J. (2017). Epidemiology of gender dysphoria and transgender identity. Sexual Health, 14(5), 404–411. source.
• Zucker, K. J. (2019). Adolescents with Gender Dysphoria: Reflections on Some Contemporary Clinical and Research Issues. Archives of Sexual Behavior. source.