ALL psychiatric 'disorders' are in that book (Diagnostic and Statistical Manual of Mental Disorders) through VOTING not through any scientific study of the 'disease'. That is why Psychiatry is a fraud and why you can have two psychs on opposing sides of a court case and say the completely the opposite about the same man or woman.
Ask Prof. Thomas Szasz - oh, you can't because he died in 2012. But here in his own words:
"Except for a few identifiable brain diseases, such as Alzheimer's disease, there are "neither biological or chemical tests nor biopsy or necropsy findings for verifying or falsifying DSM diagnoses", i.e., there are no objective methods for detecting the presence or absence of mental illness." Source: https://en. wikipedia.org/wiki/Thomas_Szasz
A bit about him:
He served for most of his career as professor of psychiatry at the State University of New York Upstate Medical University in Syracuse, New York. A distinguished lifetime fellow of the American Psychiatric Association and a life member of the American Psychoanalytic Association, he was best known as a social critic of the moral and scientific foundations of psychiatry, as what he saw as the social control aims of medicine in modern society, as well as scientism. His books The Myth of Mental Illness (1961) and The Manufacture of Madness (1970) set out some of the arguments most associated with him.