When a person's gender identity and body do not match, they may go to see a doctor. The doctor may help them change their body if that is what they want. A psychiatrist may diagnose this person with Gender identity disorder (gender dysphoria), but medical diagnosis itself is a controversial subject because being transgender has one been considered to be a mental illness, the stigma is still there. Principle 18 of the Yogyakarta Principles, a document about international law on human rights states that "any classifications to the contrary, a person's gender identity is not in and of itself, medical condition". And "Activist's Guide" to them says that "gender identity" or "gender identity disorder" exists still in categories of mental illness, contrary to the "sexual orientation" removed from such categories.