re: Transgender and mental illness

This is my thought on it. No one just wakes up and says "I want to be a man" or "I want to be a woman". To go to the degree a transgender person does, it has to be more about how they feel and who they are.

Since it is something we can't really see, it is hard for us to understand, but if someone develops as one sex physically and another sex mentally. Is that really mental illness?