Obsessive-compulsive disorder (OCD) is a group of psychological disorders in which obsessive-compulsive thoughts or behaviors are the main clinical manifestation. The prevalence of OCD in the general population is about 1%, and what people usually call “cleanliness” and “Islamophobia” are all manifestations of OCD. But the fact is that people often have “obsessive-compulsive phenomena” in their lives, such as sometimes a song keeps ringing in their heads, or they always worry about whether they forgot to lock the door after leaving the house. Is the gas left on? Sometimes you may even go home to check. Maybe you remember when you were a kid, you couldn’t put your foot on the line when you were walking on a tiled road, or you had to jump a few steps to keep going. Is this also OCD? Generally speaking, if the compulsions are mild and short-lived, and if they do not cause significant anxiety or other emotions, they are normal and should not be a cause for concern. It is only when these “obsessive-compulsive phenomena” cause trouble and pain to you or others around you and affect your life or work that they may be considered OCD.