Gender identity disorder, as identified by psychologists and physicians, is a condition in which a person has been assigned one gender, usually on the basis of their sex at birth (compare intersex disorders), but identifies as belonging to another gender, and feels significant discomfort or being unable to deal with this condition. It is a psychiatric classification and describes the problems related to transsexuality, transgender identity and more rarely transvestism. It is the diagnostic classification most commonly applied to transsexuals.

The core symptom of gender identity disorders is gender dysphoria, literally being uncomfortable with one's assigned gender.

This feeling is usually reported as "having always been there" since childhood, although in some cases, it appears in adolescence or adulthood, and has been reported by some as intensifying over time.[1] Since many cultures strongly disapprove of cross-gender behavior, it often results in significant...