OCD suspicion is mainly excessive suspicion, excessive pursuit of perfection, and excessive demand for the elimination of uncontrollable factors. OCD suspicion is not judged by truth or falsity, but by whether it is excessive and reasonable. For example, patients with OCD may repeatedly doubt that their hands, touch something dirty, their body is dirty, whether the doors and windows are closed, whether they will jump when they stand on a high place, or whether they will hurt their family members when they hold a knife, or other dangerous objects. It is not always false to have such doubts, but there is some truth to them. However, the biggest root of the disease in OCD patients is repeated doubts and repeated confirmations, excessive doubts, and excessive seeking of assurance, and even many repeated behaviors and actions to counter compulsive thinking, such as repeatedly checking doors and windows, checking homework, washing hands, etc. If these behaviors occur, and very long periods of time are spent on repeated doubts, which have a great impact on one’s daily life, it is necessary to actively adjust and treat them. So the bottom line is that there may be some justification for obsessive-compulsive suspicion. The main criterion for determining obsessive-compulsive suspicion is whether this suspicion is excessive, not whether it is true or false, and it is this excessive suspicion and excessive concern that is the greatest cause of the disease and the greatest need for treatment.