Many parents find that their children have been washing their hands repeatedly lately. Children who were not very hygienic before, recently for some reason always wash their hands repeatedly, as if they could not wash their hands clean. Sometimes the hands are washed and skinned, but still washing. When asked why they keep washing their hands, the child will often say that they always feel that their hands are dirty and cannot be washed clean, so they need to keep washing them. If you look closely, you may find that your child not only washes his or her hands repeatedly, but also repeatedly checks whether the doors and windows are closed, and goes back to make sure the doors and windows are closed after a few steps. Some children will repeatedly check whether the homework is done correctly, whether the words are written correctly, and whether the math problems are calculated correctly, which often results in a significant decrease in homework speed and often incomplete exams. It’s not that he can’t do the problems, it’s that repeated checking wastes a lot of time and it’s hard to finish the exam paper on time. In serious cases, there may be one step and three steps back, and the child always feels that he has dropped something from his pocket, so he has to keep looking back and scanning the floor to make sure he has not lost anything. If you encounter this, parents are advised to seek prompt psychiatric or psychological consultation. It is possible that your child is suffering from OCD. Obsessive Compulsive Disorder (OCD) is a neurological disorder characterized by uncontrollable obsessive thoughts and compulsive behaviors that often interfere with an individual’s social functioning and have a negative impact on families. Obsessive compulsive thoughts are thoughts, ideas, and impulses that recur in the mind and that the child knows should not occur, but is unable to get rid of them and is very distressed by them. For example, if the child has doubts about the correctness of his or her words and actions, compulsive doubts appear, followed by compulsive checking behaviors. Compulsive behavior is the repeated occurrence of stereotyped behaviors or ritualistic actions, which are usually secondary to compulsive thinking and are the result of an attempt to alleviate the internal pain experienced during compulsive thinking. Examples include compulsive checking, compulsive cleaning, compulsive counting and compulsive ritual actions. The child knows that the recurring thoughts or behaviors are unnecessary or even ridiculous, but he or she just can’t control them and is distressed by them. The essence of OCD is an anxiety disorder. The cause of the disorder is still unclear. The main influencing factors that are certain include genetic factors, the pre-morbid personality of the affected person, and psychosocial factors. Mild OCD can be relieved by psychological counseling and through psychotherapy such as exposure therapy and cognitive therapy. Severe cases of OCD may require anti-OCD medication. The main therapeutic drugs used are selective 5-hydroxytryptamine reuptake inhibitors (SSRIs), including paroxetine, sertraline, fluvoxamine, fluoxetine, citalopram, and the tricyclic antidepressant clomipramine. In conclusion, parents need to take their children to the doctor promptly if symptoms such as repeated hand washing and repeated examinations occur. Early detection, early intervention, early treatment, better treatment results and better prognosis.