Introduction: In everyday life, we find children or adults who involuntarily count the bells, steps, or even the stars in the sky; who concentrate on a term, rhyme, or allusion; who ponder a written text over and over again; who forget to explore a formula or theorem; who get up, eat, go to work, and go to sleep in a meticulous order. This phenomenon is called compulsion in medical science. Explanation: We all have habits, patterns and routines that keep us clean, healthy and safe. We wash our hands before eating, lock our doors before leaving home, and turn off the gas before going to bed. We hum songs at work, read or think about tomorrow’s outfit before we go to sleep, and so on – all habits that keep us comfortable and cozy. But some people’s lives are manipulated by thoughts and behaviors, such as thinking about the same problem over and over again or doing the same thing over and over again, even though they know these thoughts and behaviors are unnecessary and they struggle to stop. When these thoughts and behaviors interfere with a person’s normal life, they may suffer from a psychological disorder that we call obsessive-compulsive disorder. OCD, also known as obsessive-compulsive neurosis, is one of the anxiety spectrum disorders. Patients with this disorder are always troubled by obsessive thoughts or compulsive behaviors. The patient has recurrent obsessive thoughts or/and compulsive behaviors in daily life. The patient knows that this is unnecessary and even painful, but suffers from the inability to get rid of it. Question: With the development of human society and the increase of people’s mental stress, OCD has quietly become a common and frequent disease among modern people. Sometimes certain manifestations of people’s unconsciousness have actually foretold the emergence of OCD, so what kind of manifestations of OCD are there? Explanation: OCD has different manifestations in different people, and these manifestations may vary widely. In summary, there are two major manifestations of OCD: obsessive-compulsive thinking and obsessive-compulsive behavior; obsessive-compulsive thinking is divided into obsessive-compulsive associations (repeatedly envisioning a series of unfortunate events, knowing that they are impossible but unable to restrain them, and provoking emotional tension and fear); obsessive-compulsive memories (repeatedly recalling something that has been experienced in a headless manner, knowing that it is meaningless but unable to restrain it and must be recalled repeatedly); and obsessive-compulsive Doubt (unnecessary doubts about the correctness of one’s own behavior, to verify repeatedly. For example, after leaving the house, I wonder if the doors and windows are closed, and I go back several times to check, otherwise I get anxious); compulsive exhaustive thinking (repeatedly thinking about natural phenomena or daily life events, knowing that they are meaningless, but I cannot restrain them, such as why the house faces south but not north, and whether the chicken or the egg comes first?) Compulsive oppositional thinking (two opposing words or concepts repeatedly appear in the mind at the same time, to the point of distress and tension, such as “walking forward” immediately followed by “walking backward”. (When we say “good people”, we immediately think of “bad people”); compulsive behavior is also divided into compulsive washing (repeatedly washing hands or objects, and the word “dirty” is always in the mind. (I know I’ve washed it, but I want to wash it again); compulsive inspection; compulsive counting, compulsive ritual actions, etc. There are also some physical dysfunctions that are also manifestations of OCD. Only these somatic disorders are often associated with obsessive-compulsive personality disorders, such as difficulty sleeping due to inability to get rid of obsessive thoughts and doubts, tension headaches, gastrointestinal function problems, writing spasms and other dystonic abnormalities, etc. Question: According to a recent survey, one in fifty people worldwide will have OCD. For example, there are more than one million people with OCD in the UK, such as the British soccer star David Beckham, whom we know well, and the famous biologist Darwin, who both suffered from OCD. Explanation: OCD is a psychological disorder with a complex etiology. Many researchers have explored the causes of this phenomenon from neurobiochemistry, genetics and psychology respectively, but so far there is no very convincing explanation, and more and more evidence suggests that: abnormal changes occur in the brain of OCD patients, environmental factors may also play a role, and OCD also presents the phenomenon of family clustering, suggesting There is also a genetic correlation. It has been suggested that it starts as a result of one’s own personality, and in order to overcome the anxiety brought about by a particular event, one experiences repeated excessive or repetitive obsessive thoughts and compulsive behaviors, leading to a dysregulation of central nervous excitation and inhibition. This reinforces and leads to the formation of such habits, resulting in the formation of OCD. In addition, it has also been found that 75% of patients have a high IQ and are mostly of the white-collar class. Question: It is generally believed that an important factor in judging OCD is whether or not a certain behavior is repeated over and over again. In fact, not all repetitive behaviors are a sign of OCD. So how is OCD diagnosed? Explanation: To determine whether or not a person really has OCD, the doctor needs to communicate with the patient for a certain amount of time and rule out other mental illnesses through various tests before a diagnosis can be confirmed. Even the patient’s diagnosis is not finalized by some OCD self-test forms. At best, we can only understand whether the person has obsessive-compulsive tendencies through the assessment results, and people with obsessive-compulsive tendencies may not actually all suffer from OCD. Therefore, there is no need to be alarmed by the occasional occurrence of obsessive-compulsive symptoms. If the compulsive symptoms persist and the person begins to feel distressed and interfere with normal work and study, he or she should seek prompt medical attention. Obsessive-compulsive tendency test: If the following problems occur more frequently and with higher intensity, it means that the likelihood of having OCD will be higher. Unnecessary thoughts or words hovering in the mind; feeling difficulty in completing tasks; having to do things very slowly to make sure they are done correctly; having to check things over and over again; difficulty in making decisions; repeatedly thinking about meaningless things; inability to concentrate; repeatedly doing a meaningless action; uncontrollable opposing thoughts and ideas; poor memory.