There are three criteria for determining psychiatric disorders, i.e., diagnostic classification systems, the International Classification of Diseases and Related Health Problems (ICD), the Diagnostic and Statistical Manual of Mental Disorders (DSM), and the Chinese Criteria for the Classification and Diagnosis of Mental Disorders (CCMD). Psychiatric disorders are broadly defined as all psychiatric disorders and narrowly defined as schizophrenia. Diagnostic criteria for schizophrenia should be made by combining medical history, clinical symptoms, physical examination and laboratory findings. For example, with thought ringing, hallucinations, delusions, catatonic behavior, negative symptoms, etc., with a persistent course of schizophrenia. In addition to schizophrenia, there are also depression, anxiety disorders, phobias, neuroses, somatoform disorders, and stress-related disorders in a broad sense. Each of these is judged by different criteria. However, any mental illness should be diagnosed and treated by a professional psychiatrist. If you are suffering from a mental illness that affects your normal life and social life, you should go to a professional hospital in time and should not use medication on your own.