A classic example of this disease is the fear of pollution, in which the patient every contact with dirty, in his opinion, objects causes discomfort and, as a result, obsessive thoughts. To get rid of these thoughts, he begins to wash his hands. But even if at some point it seems to him that he has washed his hands enough, any contact with a “dirty” object causes him to start his ritual again. These rituals allow the patient to temporary relief. Despite the fact that the patient is aware of the meaninglessness of these actions, he is not able to fight them.