This change was made to reflect the consensus view by members of the APA that transsexuality is not in and of itself a disorder and that transsexual people should not be stigmatized unnecessarily. By including a diagnosis for gender dysphoria, transsexual people are still able to access medical care through the process of transition. The current diagnosis for transsexual people who present themselves for medical treatment is gender dysphoria (leaving out those who have sexual identity disorders without gender concerns). According to the Standards of care formulated by WPATH, formerly the Harry Benjamin International Gender Dysphoria Association, this diagnostic label is often necessary to obtain sex reassignment therapy with health insurance coverage, and the designation of gender identity disorders as mental disorders is not a license for stigmatization or for the deprivation of gender patients civil rights. Causes, studies, and theories
Causes
Studies conducted on twins suggest that there are likely genetic causes of gender incongruence, although the precise genes involved are not known or fully understood.
However, a precise history is difficult because the modern concept of being transgender, and gender in general, did not develop until the mid-1900s. Historical understandings are thus inherently filtered through modern principles, and were largely viewed through a medical lens until the late 1900s.Ancient Greek Hippocrates (interpreting the writing of Herodotus) discusses transgender individuals briefly. He describes the "disease of the Scythians" (regarding the Enaree), which he attributes to impotency due to riding on a horse without stirrups. Hippocrates reference was well discussed by medical writings of the 1500s–1700s. Pierre Petit writing in 1596 viewed the "Scythian disease" as natural variation, but by the 1700s writers viewed it as a "melancholy", or "hysterical" psychiatric disease. By the early 1800s, being transgender separate from Hippocrates idea of it was claimed to be widely known, but remained poorly documented. Both MtF and FtM individuals were cited in European insane asylums of the early 1800s. The most complete account of the time came from the life of the Chevalier dÉon (1728–1810). As cross-dressing became more widespread in the late 1800s, discussion of transgender people increased greatly and writers attempted to explain the origins of being transgender. Much study came out of Germany, and was exported to other Western audiences. Cross-dressing was seen in a pragmatic light until the late 1800s; it had previously served a satirical or disguising purpose.