Fuzzy mathematics is a kind of mathematics to find the exact mathematical solution of fuzzy phenomena. Fuzzy mathematics is a method to solve fuzzy things with accurate mathematical methods. Some people think that mathematics has entered the stage of fuzzy mathematics, and scientists have made many achievements on the basis of understanding fuzzy mathematics. However, in the study, we also found that if experts in various diseases completely inherited the symptoms and descriptions of the diseases they studied, in fact, it was sometimes wrong to do so. Therefore, we put forward the view that "in the face of symptoms, disease and disease are equal", which has been proved to be feasible in practice. The theoretical basis of symptom score is the membership degree of fuzzy mathematics; We believe that laymen can also diagnose diseases, and that fuzzy mathematics is the best way to deal with fuzzy things. Without the guidance of fuzzy mathematics, there is no mathematical diagnosis.