You must have had the experience of going out, but do not remember whether the door is locked, and sometimes go back to check. In fact, this is obsessive-compulsive disorder. People seem to be driven by a force but are powerless to resist, constantly producing specific thoughts or behaviors involuntarily. OCD consists of two elements: one element is obsessive thinking, which refers to lingering thoughts, and the other element is compulsive behavior, which refers to specific behaviors that occur repeatedly. Many people have experienced something like this: having something on their mind all the time; having a certain melody or sound echoing in their head that they don’t want to hear; being distracted by not getting an item in order; having to go back multiple times after leaving the house to check that the door is locked, etc. In these cases, people seem to be driven by a force that they are unable to resist, and they continue to think or act in a certain way involuntarily. So, do all of these people have OCD? To better understand obsessive-compulsive psychology or OCD, let’s imagine a scenario: Xiao Qiang is on a date with his girlfriend and suddenly feels agitated after the meeting. His girlfriend was puzzled and asked why, but Qiang left a sentence “I have to go check again”, and returned home without looking back. Back, but he did not enter the home, but hard, repeatedly twist the handle outside the door to test whether the door has been locked. The door has been locked again and again before remembering the dating girlfriend, this has happened more than once. Xiao Qiang’s girlfriend finally could not stand it and decided to break up, no matter how Xiao Qiang pleaded ultimately failed to restore the situation. What is Obsessive Compulsive Disorder? Obsessive-Compulsive Disorder (OCD) is a neurological disorder characterized by obsessive-compulsive thoughts and actions. It is characterized by the co-existence of conscious self-compulsion and conscious counter-compulsion. The patient knows that the persistence of obsessive-compulsive symptoms is meaningless and irrational, but he or she cannot restrain their recurrence. If the disease is prolonged, ritualistic movements may be the main manifestation, and although the mental pain is significantly relieved, the social function is severely impaired. It is generally believed that one out of every fifty people has OCD, for example, there are more than one million people with OCD in the UK, and the prevalence is very high among adolescents. The seeds of obsessive-compulsive psychology can easily appear in specific trivial matters, and the prevention of OCD requires adequate sleep, proper exercise and regular participation in group social activities.