Diarrhea and anal pain should be treated according to the specific cause, including the application of drugs, surgical treatment and so on. 1. Physiological factors: after eating chili peppers recently, due to defecation capsaicin will stimulate the local skin of the anal canal, so the symptoms of diarrhea and anal pain can occur, this situation only need to pay attention to avoid eating chili peppers, and eat a light diet. 2. Coloproctitis: repeated diarrhea stimulation can lead to rectal mucosal edema. Diarrhea can lead to anal pain. At this time, you should take haloperidol, amoxicillin and other antibiotics to treat intestinal inflammation, or take salicylic acid azinesulfapyridine treatment. 3. Anal fissure: anal fissure is a kind of anal canal skin layer cracks, the local formation of small ulcers of the disease, this kind of patients in diarrhea, due to the anal sphincter muscle expansion and contraction, so there can also be diarrhea anal pain symptoms. Usually available 1:5000 potassium permanganate solution sitz bath, or topical lidocaine gel pain treatment. If the condition is serious, you can also choose surgical treatment. In addition, anal and intestinal diseases such as sinusitis, perianal abscess, anal fistula, etc., may also lead to anal pain when diarrhea. Therefore, if the symptoms of diarrhea and anal pain persist, you should consult a doctor for a clear diagnosis and then ask the doctor to deal with it.