The symptoms of anal itching and odor are mainly caused by perianal diseases. First, hemorrhoids can cause anal itching and odor. Hemorrhoids are mainly caused by varicose veins around the anus, which can form blood clots and venous blood clusters around the anus, especially the hemorrhoidal core of internal hemorrhoids is easy to prolapse outside the anus, and bring out intestinal fluids and secretions, resulting in itching around the anus and the symptom of bad smell. Secondly, perianal abscess can also cause this symptom. Perianal abscesses can form abscesses or lumps around the anus and cause pus to leak out of the anus from the intestines, resulting in itching, redness, swelling and pain around the anus. In addition, perianal eczema forms pimples and breakouts on the skin around the anus, which can become infected by bacteria and cause itching and odor.