Anal tightness and inability to fart are usually caused by hemorrhoids, anal fissure, and intestinal lumen obstruction. 1. Hemorrhoids: Hemorrhoids can cause swelling, pain, and anal constriction in the anus, which can lead to the symptoms of anal tightness and inability to fart. 2. Anal fissure: Anal fissure is a small ulcer formed when the skin of the anal canal splits open at the whole layer, which usually causes sphincter contracture, leading to the patient’s anal tightness and inability to release farts. 3. Intestinal obstruction: Intestinal obstruction is due to the intestinal tract is blocked by food, tumors, etc., there will be anal contraction, pain symptoms, triggering the patient to appear anal tightness, farts can not be released. The causes of anal tightness and farting are rectal cancer, systemic sclerosis, dermatomyositis, etc. It is recommended that patients go to the hospital in time for examination, clear diagnosis, and appropriate treatment under the guidance of the doctor.