Hysteria is a type of psychosis, also known as dissociative conversion disorder or hysteria, and is a mental disorder caused by psychiatric factors acting on a susceptible individual, such as life events, internal conflicts, suggestion or self-referral. Hysteria often develops suddenly after a more severe psychological trauma. The main symptoms are divided into dissociative and conversion symptoms, which are manifested as acute onset, transient psychotic disorder, selective amnesia or confusion. The symptoms are mostly confusion of personal behavior, unclear identification of self, loss of partial or total memory, possible sudden departure from home, purposeless walking, and numbness and rigidity of the body. Hysteria is mostly a conversion reaction caused by the patient’s internal conflicts and unresolvable contradictions, and there are no organic physical lesions, so it belongs to the category of psychosis. The symptoms of dysthymia are functional and therefore psychotherapy is the main treatment for the disease. The prognosis is generally good, with 60%-80% of patients resolving on their own within one year. However, hysteria is prone to relapse, so it is recommended that patients and their families should understand the disease objectively and accurately, remove the causes of hysteria in a timely manner, address their own character defects, and improve interpersonal relationships to avoid relapse.