A person may be considered to be a transgender person if their gender identity is inconsistent or not culturally associated with the sex they were assigned at birth, and consequently also with the gender role and social status that is typically associated with that sex. They may have, or may intend to establish, a new gender status that accords with their gender identity. Transsexual is generally considered a subset of transgender, but some transsexual people reject being labelled transgender.
Globally, most legal jurisdictions recognise the two traditional gender identities and social roles, man and woman, but tend to exclude any other gender identities, and expressions. However, there are some countries which recognize, by law, a third gender. There is now a greater understanding of the breadth of variation outside the typical categories of "man" and "woman", and many self-descriptions are now entering the literature, including pangender, , genderqueer and agender. Medically and socially, the term "transsexualism" is being replaced with gender identity or gender dysphoria, and terms such as transgender people, trans men and trans women are replacing the category of transsexual people.
This raises many legal issues and aspects of transgenderism. Most of these issues are generally considered a part of family law, especially the issues of marriage and the question of a transsexual person benefiting from a partner's insurance or social security.
The degree of legal recognition provided to transgenderism varies widely throughout the world. Many countries now legally recognise sex reassignments by permitting a change of legal gender on an individual's birth certificate. Many transsexual people have permanent surgery to change their body, Sexual Reassignment Sugery (SRS) or semi-permanently change their body by hormonal means, Hormone Replacement Therapy (HRT). In many countries, some of these modifications are required for legal recognition. In a few, the legal aspects are directly tied to health care; i.e. the same bodies or doctors decide whether a person can move forward in their treatment, and the subsequent processes automatically incorporate both matters.