There are many reasons for anal odor, including physiological reasons and pathological reasons, the latter can be caused by external hemorrhoids, perianal abscess and other diseases. 1. Physiological reasons: If you don’t pay attention to hygiene in your normal life, the phenomenon of anal odor may occur for a long time. It is recommended to wash clothes in time, pay attention to keep anal hygiene clean and clean, do not need special treatment. 2. External hemorrhoids: due to sedentary standing, constipation and other factors, external hemorrhoids can appear anus unclean, moist and other symptoms, resulting in anal odor. In addition, external hemorrhoids may also have symptoms such as blood in the stool, pain, and a feeling of anal swelling. 3. Perianal abscess: mostly due to acute suppurative infection of the rectum, perianal space, the abscess breaks down and may appear the phenomenon of anal odor. Usually there is pain, pus, lumps and other symptoms. It is recommended to go to the hospital in time, after clarifying the cause of the disease, under the guidance of the doctor’s treatment. Keep the skin around the anus clean and dry in daily life to prevent infection and follow the doctor’s instructions.