A trans man (sometimes trans-man or transman) is a transgender person who was assigned female at birth but whose gender identity is that of a man. The label of transgender man is not always interchangeable with that of transsexual man, although the two labels are often used in this way. Transgender is an umbrella term that includes different types of gender variant people (including transsexual people). Many trans men choose to undergo surgical or hormonal transition, or both (see sex reassignment therapy), to alter their appearance in a way that aligns with their gender identity more appropriately or alleviates gender dysphoria.