No. Being gay is not a mental illness. Every major medical and psychiatric organization in the world recognizes sexual orientation as a normal variation of human sexuality, not a disorder or condition requiring treatment. The American Psychiatric Association removed homosexuality from its official list of mental disorders in 1973, and the scientific consensus has only strengthened since then.
Why It Was Once Classified Differently
For much of the 20th century, homosexuality appeared in the Diagnostic and Statistical Manual of Mental Disorders (DSM), the reference guide used by mental health professionals in the United States. Its inclusion reflected the cultural attitudes of the time more than rigorous science. As researchers began studying gay and lesbian people who were not psychiatric patients, they found no evidence that sexual orientation caused impairment in judgment, emotional stability, reliability, or social and professional functioning.
On December 15, 1973, the American Psychiatric Association voted to remove homosexuality from the DSM. The American Psychological Association quickly endorsed the decision. A compromise category called “ego-dystonic homosexuality,” meant to describe people distressed by their own orientation, lingered in the manual until 1987, when it too was removed. The reasoning was straightforward: the distress these individuals experienced was driven by social stigma, not by anything inherent to being gay.
What Medical Organizations Say Today
The current DSM (the DSM-5-TR) contains no diagnosis related to sexual orientation. The American Psychiatric Association explicitly distinguishes sexual orientation from any psychiatric condition. The American Medical Association states plainly that the assumption that homosexuality is a mental disorder “is not based on medical or scientific evidence” and that professional consensus rejects pathologizing it. The World Health Organization removed homosexuality from its International Classification of Diseases in 1990.
These aren’t fringe positions. They represent the settled view of the institutions that define what mental illness is and how it’s diagnosed. No credible medical body anywhere in the world classifies being gay as a disorder.
Why “Conversion Therapy” Is Harmful
Because homosexuality is not an illness, there is nothing to “cure.” Attempts to change a person’s sexual orientation, often called conversion therapy, have been consistently shown to cause psychological harm rather than produce any meaningful change in orientation.
A Stanford Medicine study of more than 4,400 participants found that people who had undergone conversion practices reported greater symptoms of depression, post-traumatic stress disorder, and suicidal thinking. Those who experienced formal efforts to change their sexual orientation showed more PTSD symptoms specifically, while those subjected to efforts targeting gender identity exhibited more depression. People exposed to both types of conversion practices had the worst outcomes, with elevated PTSD symptoms and suicidality. The AMA now formally opposes the use of conversion therapy.
Stigma, Not Orientation, Drives Health Disparities
LGBTQ+ people do experience higher rates of depression, anxiety, and suicidal thoughts compared to their heterosexual peers. CDC data from the 2023 Youth Risk Behavior Survey found that 65% of LGBTQ+ students reported feeling sad or hopeless, compared to 31% of their cisgender, heterosexual classmates. Forty-one percent of LGBTQ+ students had seriously considered suicide, versus 13% of their peers. These numbers are striking, but they don’t mean that being gay causes mental illness. They reflect the toll of growing up in environments where you face rejection, discrimination, and violence.
Researchers call this the minority stress model. First outlined by psychologist Ilan Meyer in the 1990s, it explains how external pressures like prejudice, family rejection, bullying, and discriminatory laws create chronic stress that wears down mental health over time. The stress operates through specific pathways: expecting rejection, hiding your identity, and internalizing negative messages about who you are. These experiences can lead to rumination, social isolation, and shame, which in turn raise the risk of depression, anxiety, and substance use.
The effects aren’t just psychological. Chronic minority stress can alter the body’s stress-response system, increasing inflammation, suppressing immune function, and disrupting cardiovascular and metabolic health. In other words, stigma doesn’t just hurt emotionally. It changes biology. But the source of that harm is the hostility of the environment, not the person’s orientation.
What the Evidence Actually Shows
When LGBTQ+ people live in supportive environments with accepting families, inclusive schools, and legal protections, the mental health gap narrows substantially. This is one of the clearest signs that the disparities are driven by how society treats gay people, not by something wrong with being gay. Sexual orientation itself does not impair functioning, cause distress, or meet any clinical criteria for a mental disorder. The science on this point is not ambiguous, and it hasn’t been for decades.