"First, one of the most important – and, for many, confusing – questions: why do some trans people need medical intervention at all? Dysphoria, the antonym of ‘euphoria’, is the clinical term now used to describe the intense feeling of anxiety, distress or unhappiness some trans people feel in relation to their primary sex characteristics (genitals), their secondary sex characteristics (breasts, facial hair, menstruation, face shape, voice) or how these physical traits cause society to interact with them, by perceiving them as a male or female. Previously called 'gender identity disorder' and, before that, 'transsexualism', gender dysphoria is the name given to an experience many trans people struggle with, which can be helped by medical intervention. Although the term is widely used within the community, different trans people can experience dysphoria in very different ways, and so might have different clinical needs."