Obsessive-compulsive neurosis (OCD for short). It is characterized by repeated and persistent obsessive thoughts or compulsive actions as the main symptom. These symptoms are internalized by the patient, but are not experienced and produced voluntarily, rather they are unwanted by the patient. The patient knows that they are irrational, but cannot get rid of them, making them painful and incompatible with his or her personality. Obsessive-compulsive disorder (OCD), a type of anxiety disorder, is a group of neuropsychiatric disorders characterized by obsessive-compulsive thinking and compulsive behavior. Although patients experience these thoughts or impulses as originating from themselves and try to resist them, they are always unable to control them. Sometimes people often do some meaningless things repeatedly, not only wasting time but also energy, such as repeatedly checking whether the door is closed, whether the lock is locked, repeatedly washing hands, etc. This behavior and concept, medically known as obsessive-compulsive disorder, belongs to the category of neurosis. As long as obsessive-compulsive ideas and compulsive behavior interfere with the normal mental activities of the patient himself, and affect his ability and behavior, affecting interpersonal relationships or the well-being of the family, then it is necessary to seek medical attention in a timely manner, so as not to affect the relationship between friends and family and normal life. So, what exactly is the cause of OCD? 1, compulsive thoughts and anxiety related. 2, compulsive behaviors (outward or hidden) are random behaviors that aim to reduce anxiety and discomfort. However, anxiety reduction leads to compulsions being reinforced. 3. To prevent obsessive thoughts and anxiety from occurring, people often engage in avoidance behaviors, but avoidance behaviors prevent the exposure of anxious thoughts and behaviors. According to the above mental model. The treatment strategy should be to facilitate the exposure of fearful stimuli, while encouraging them to meet the rituals of exposure and cognitive avoidance that are not easily detected, which requires a thorough examination and assessment by the physician. In the past, most people believed that the disease originated from psychiatric factors and personality defects; in recent years, genetic factors have been found to be more pronounced.