Gender dysphoria or
gender identity disorder (
GID) is the formal
diagnosis used by
psychologists and
physicians to describe people who experience significant
dysphoria (distress) with the
sex and
gender they were
assigned at birth. Evidence suggests that people who identify with a gender different from the one they were assigned at birth may do so not just due to psychological or behavioral causes, but also biological ones related to their genetics, the makeup of their brains, or prenatal exposure to hormones.