Dysthymia, or dissociative disorder, is a psychosomatic disorder in which patients develop complex psycho-physiologic disorders such as amnesia and somnambulism, which can be complicated by anxiety, depression, and sleep disorders. Normal people’s perception, consciousness and memory etc. are a whole, but hysterical patients will experience intermittent and involuntary loss of all or part of psychophysiological integration, and symptoms such as dissociative identity disorder, dissociative amnesia and depersonalization. Dissociative identity disorder may be characterized by the presence of two or more personalities in the patient, with switching between personalities, during which the patient may experience memory impairment. Dissociative amnesia is mainly when the patient will not be able to recall important information, even their own identity. Depersonalization is when the patient feels that he or she is acting as a bystander, observing himself or herself from another perspective, sometimes feeling that the surroundings are unreal, as if there is a membrane between himself or herself and the outside world. The development of the disease is usually closely related to psychological factors, and most often caused by traumatic events such as abuse, rape and other stimuli. Patients need to seek timely medical treatment to receive professional psychotherapy, such as hypnotherapy, induction therapy, systematic desensitization therapy. If necessary, follow the doctor’s prescription medication.