yes it is a mental disorder
no it is a real birth defect
"Never fear. Him is here" - Captain Chaos (Dom DeLuise), Cannonball Run
Mace Windu: Then our worst fears have been realized. We must move quickly if the Jedi Order is to survive.
Answers to your Questions About Transgender People, Gender Identity, and Gender ExpressionA psychological state is considered a mental disorder only if it causes significant distress or disability. Many transgender people do not experience their gender as distressing or disabling, which implies that identifying as transgender does not constitute a mental disorder. For these individuals, the significant problem is finding affordable resources, such as counseling, hormone therapy, medical procedures and the social support necessary to freely express their gender identity and minimize discrimination. Many other obstacles may lead to distress, including a lack of acceptance within society, direct or indirect experiences with discrimination, or assault. These experiences may lead many transgender people to suffer with anxiety, depression or related disorders at higher rates than nontransgender persons.
According to the Diagnostic and Statistical Manual of Mental Disorders (DSM-5), people who experience intense, persistent gender incongruence can be given the diagnosis of "gender dysphoria." Some contend that the diagnosis inappropriately pathologizes gender noncongruence and should be eliminated. Others argue that it is essential to retain the diagnosis to ensure access to care. The International Classification of Diseases (ICD) is under revision and there may be changes to its current classification of intense persistent gender incongruence as "gender identity disorder."
They are clearly showing that there is disagreement in the mental health community.
Suicides are also something crazy like 27 times more likely among trans. I wonder why? Because it's deep mental disorder.