Obsessive-compulsive disorder, also known as OCD, is a neurotic or anxiety disorder. It is classified as “obsessive-compulsive disorder and obsessive-compulsive-related disorders” in the latest American Classification and Diagnostic Criteria of Mental Disorders (ACD), making it one of the major mental illness categories. OCD affects about one in every fifty people in the population. Because the disorder is so painful and often chronic and recurrent, it has a serious impact on human mental health. Early detection and early and thorough treatment is of great importance. Generally, if a person has recurrent thoughts, impulsive intentions, images, or repetitive actions or behaviors in his or her mind, and feels anxious and distressed because it is difficult to control or get rid of them. This is a sign of OCD. The following questions can help you determine if you have OCD: 1) unnecessary thoughts or words swirling around in your mind; 2) feeling as if you are forgetful and worried about remembering things; 3) worrying about not being properly dressed and groomed; 4) fixating on details and having difficulty completing tasks that should be done; 5) having to do things slowly to make sure they are done correctly; 6) checking things over and over again; 7) thinking about something over and over again and having difficulty making a decision; 8) thinking about something over and over again and having difficulty making a decision; 8) thinking about it over and over again. Difficult to make a decision; 8, repeatedly think about something seemingly meaningless; 9, feel unable to focus; 10, repeatedly wash their hands, counting; 11, repeatedly do a meaningless action; 12, often suspected of being contaminated; 13, always associated with the occurrence of unfortunate events in the loved ones; 14, the emergence of uncontrollable opposing thinking, ideas. 15.Repeatedly say a phrase or the same name or walk in the same place stereotypically. 16.When wearing headphones must see the left and right before wearing; 17.Repeatedly check or wipe glasses; excessive attention to dressing, taking too long to miss; 18.Suspect that the door is not locked, and repeatedly think or check; 19.See others did not wipe the blackboard clean and feel awkward; 20.See a sentence or a paragraph repeatedly when reading or doing problems feel unable to read or misread. 21, lingering superstitious thoughts or other supernatural ideas 22, the mind repeatedly lingering annoying sounds, images, scenes; if you find yourself with the above phenomena, you need to see a doctor to confirm the diagnosis, pay attention to exclude schizophrenia, organic brain mental disorders. OCD sometimes coexists with other psychiatric disorders such as hypochondria, phobias, generalized anxiety disorder, bulimia and anorexia disorder, depression and other disorders and needs to be diagnosed side by side. As for treatment: Mild self-regulation or as long as there is no significant impact on work life is not a problem. On the contrary, if you are worried about it, it is not necessary. Moderate cases can be treated with psychotherapy alone or with anti-compulsive drugs. In severe cases, when it is difficult to control the pain, it is necessary to use drugs, if necessary, combined with antipsychotics may improve the effectiveness of treatment, and pay attention to the management of comorbidities. Severe cases often have complex psychological problems as well, such as serious deviations in personality, stubborn adherence to their many distorted beliefs, and great resistance to treatment, where the difficulty of treatment often lies.