”OCD, also known as “obsessive-compulsive neurosis,” is a relatively common neurological disorder. OCD is not uncommon in real life. For example, we sometimes meet people who love cleanliness, and they always wash their hands or clothes repeatedly, this is what we call “cleanliness”, these people with “cleanliness” is actually OCD patients. The performance of OCD patients is very characteristic, they can’t help but think about some meaningless problems, or appear repeatedly can’t control the repetitive action. The person knows that these thoughts, ideas and actions are unnecessary, but he or she cannot get rid of them and feels very distressed. For example, patients with “compulsive hand washing” always feel that their hands are not clean and they feel very uncomfortable, so they often spend a long time washing their hands to feel clean and comfortable. But soon after washing their hands they feel that it is not normal for them to wash their hands for such a long time, and that it is different from normal people, and they start to feel uncomfortable in their hearts and resolve to overcome the behavior of washing their hands for a long time. But soon afterwards, they feel that their hands are dirty again, and they can’t control washing their hands for a long time. Therefore, patients with “compulsive handwashing” are very uncomfortable, painful, and torn whether they wash their hands or not, and they rarely feel relaxed and calm. The manifestations of OCD can usually be divided into two categories: obsessive-compulsive thoughts and compulsive behaviors. Patients with obsessive-compulsive behavior often doubt the reliability of what they have done, repeatedly checking doors, windows, appliances and switches, and checking the accuracy of study assignments. Repeated hand washing and laundering of clothes are also compulsive behaviors. The specific cause of OCD is unknown, but it begins as early as adolescence, with an average age of onset of about 20 years old, and 75% of patients develop obsessive-compulsive symptoms before the age of 30. Patients with OCD have different degrees of severity of symptoms, and those with mild symptoms can often live a “normal” life with their obsessive-compulsive symptoms, while many patients with severe symptoms have an early onset and persist for many years. Many people with OCD start early and have the condition for many years. A global disease survey conducted by the World Health Organization (WHO) found that OCD has become one of the top 20 diseases that cause the greatest burden of disease among young and middle-aged people aged 15 to 44. However, many patients do not seek medical attention at the beginning of the disease due to various concerns, and about 60% of patients seek medical attention more than 10 years after the onset of the disease until their symptoms are so severe that they cannot live a normal life, which greatly increases the difficulty of treatment. Some studies have found that some OCD patients’ obsessive-compulsive symptoms will naturally resolve or disappear after a period of time, but in about 60% of patients the disease gradually progresses, and if the obsessive-compulsive symptoms last longer than a year, the treatment becomes significantly more difficult. Therefore, we should pay more attention to OCD, not to avoid treatment, and treat it as early as possible.