Men’s lower abdominal distension with incomplete bowel movement is considered to be caused by gastrointestinal dysfunction, inflammatory bowel disease, hemorrhoids, rectal tumors and other disease factors. 1. Gastrointestinal dysfunction: after an intestinal infection, the normal physiological environment of the gastrointestinal tract is damaged and imbalanced, and the abnormal function can cause abdominal distension, diarrhea, incomplete bowel movement, abdominal pain and other symptoms. Oral probiotics such as Lactobacillus acidophilus can be taken under doctor’s supervision. 2. Inflammatory bowel disease: it is a kind of idiopathic inflammatory bowel disease, and the stimulation of intestinal inflammation can cause diarrhea, abdominal pain, incomplete bowel movement, lower abdominal distension and so on. Need timely treatment, follow the doctor’s instructions oral aminosalicylic acid preparations such as mesalazine and other treatments. 3. Hemorrhoids: patients with hemorrhoids may have internal hemorrhoids prolapse during defecation, resulting in incomplete defecation, accompanied by lower abdominal distension, local pain and other symptoms. 4. Rectal tumor: it can produce the symptoms of rectal irritation, resulting in frequent bowel movements, accompanied by the feeling of incomplete bowel movements, and anal swelling before defecation. It is necessary to improve the abdominal CT or MRI examination to clarify the stage of the disease and decide the next treatment plan. Men who experience lower abdominal distension with incomplete bowel movements are advised to go to the hospital for a doctor’s opinion to determine the cause of the disease.