The main reasons for the increasing severity of cleanliness are the following: 1, may be too concerned, because through behaviorism found that the more concerned, the higher the frequency of this matter will appear, the longer it appears, they repeatedly wash their hands, repeatedly worry about the body encounter bacteria, viruses, it will take longer and longer, they will fall into this circle. 2, may be the disease more and more serious, especially if the emergence of cleanliness The problem may not be well treated, or even ignore its development, it is easy to become more and more serious. 3, may also be due to personality factors, such as some people have a strong character, perfectionism, from childhood to the understanding of the rules are particularly stereotypical, especially clean, may grow with time and age or with their own studies, work pressure, cleanliness are easy to become more and more serious.