People with gender identity disorder act and present themselves as members of the opposite sex. The disorder affects self-concept, choice of sexual partners, and the display of femininity or masculinity through mannerisms, behavior, and dress.
The feeling of being in the body of the "wrong" gender must persist for at least 2 years for this diagnosis to be made. The cause is unknown, but hormonal influences in the womb, genetics, and environmental factors (such as parenting) are suspected to be involved. The disorder may occur in children or adults, and is rare.
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