What Is Transgender
The word Transgender or Transsexual refers to an individual who is transitioning between genders. Gender Identity Disorder or Gender Dysphoria is the medical condition.
The NHS describes the condition as follows:
Gender dysphoria is a condition where a person experiences discomfort or distress because there is a mismatch between their biological sex and gender identity.
Biological sex is assigned at birth, depending on the appearance of the genitals. Gender identity is the gender that a person "identifies" with or feels themselves to be.
While biological sex and gender identity are the same for most people, this is not the case for everyone. For example, some people may have the anatomy of a man, but identify themselves as a woman, while others may not feel they are definitively either male or female.
This mismatch between sex and gender identity can lead to distressing and uncomfortable feelings that are called gender dysphoria. Gender dysphoria is a recognised medical condition, for which treatment is sometimes appropriate. It is not a mental illness. The condition is also sometimes known as gender identity disorder (GID), gender incongruence or transgenderism.
Some people with gender dysphoria have a strong and persistent desire to live according to their gender identity, rather than their biological sex. These people are sometimes called transsexual or trans people. Some trans people have treatment to make their physical appearance more consistent with their gender identity.
Gender dysphoria is not the same as transvestism or cross-dressing and is not related to sexual orientation. People with the condition may identify as straight, gay, lesbian, bisexual or asexual, and this may change with treatment.http://www.nhs.uk/conditions/gender-dysphoria/Pages/Introduction.aspx