The main reasons for diarrhea and anal itching are as follows: First, because of eating unclean, spicy, irritating food or recent consumption of things containing more seasonings, which are not well absorbed by the intestines, when passing through the intestines will stimulate the rectal mucosa and cause itching. Second, mainly because of proctitis or because of the usual life stress caused by irritable bowel syndrome and other intestinal diseases, inflammation will not only stimulate the rectal mucosa leading to diarrhea, but also lead to imbalance in the intestinal flora caused by anal irritation, itching. Third, mainly because usually do not pay attention to the anal hygiene habits, bacteria and viruses will enter the intestine directly through the anal opening and multiply in the intestine. Bacteria will secrete toxic substances and inflammatory media, thus constantly stimulating the intestinal tract causing diarrhea and anal itching. Fourth, mainly intestinal diseases, anal canalitis or hemorrhoids, perianal abscesses, etc. will also stimulate cause this symptom. Five, mainly caused by the normal flora in the intestine dysbiosis.