In the diarrhea after perianal pain can be considered with repeated defecation, as well as anal fissure, perianal abscess formation and other reasons related to the need for timely treatment of diarrhea as well as the causes of perianal pain. 1. Short-term frequent diarrhea, defecation can make the anus and its surrounding skin and mucous membrane due to mechanical stimulation, as well as fecal chemical stimulation occurs congestion or edema, perianal fever, redness, swelling and pain. 2. Anal fissure: diarrhea is one of the important reasons for the formation of anal fissure, due to the formation of ulcers under the dentate line of the anal canal skin layer fissure, causing severe pain in the perianal area. 3. Perianal abscess: ulcerative colitis, Crohn’s disease and other intestinal diseases can cause diarrhea, abdominal pain manifestations, and its easy to complicate the rectal perianal abscess, when there is a perianal abscess formation, caused by the throbbing pain in the perianal area, lesions with redness, swelling, hardness and pressure pain, abscess formation can be fluctuating sensation. Diarrhea accompanied by perianal pain, we must consult a doctor in a timely manner to identify the causes of diarrhea and perianal pain, follow the doctor’s instructions on the cause of the symptomatic treatment, perianal pain can be used in warm water sitz baths, and keep the local clean, as well as to avoid hard friction of the local skin.