What are the characteristics of a madman? Please, thank you.

Madman is a mental illness. Mental illness refers to a serious psychological disorder, and patients' psychological activities such as cognition, emotion, will, action and behavior may appear persistent and obvious abnormalities; Unable to study, work and live normally; Action behavior is difficult to be understood by ordinary people, and it looks strange and different; Under the control of morbid psychology, people commit suicide or attack others; Patients have different degrees of self-control, and often lose judgment on their mental symptoms, think that their psychology and behavior are normal, and refuse treatment. Symptomatic psychosis is caused by the dysfunction of thalamus and brain, which leads to abnormal perception, thinking, emotion and behavior of patients. There are many types of common mental diseases, such as schizophrenia, emotional mental disorder and brain organic mental disorder. Different types of mental illness have different clinical manifestations and different treatment methods. Mental illness mostly occurs in young adults, some have intermittent attacks, some continue to progress, and gradually tend to be chronic, with high recurrence rate and high disability rate. Without active treatment, mental retardation and personality changes may occur, making it difficult to adapt to social life and fulfill the responsibilities to family and society. But if early detection and timely treatment, patients can completely recover from the disease and live, study and work normally.