Waking up at four in the morning to have a bowel movement may be a normal phenomenon, or it may be acute gastroenteritis, chronic colitis, irritable bowel syndrome and other diseases. 1. Normal phenomenon: If you wake up at 4:00 a.m. every day fixed stool, stool properties normal, no obvious nausea, vomiting, diarrhea and other symptoms, regular 1 to 2 times a day stool, should be related to the fixed bowel habits, is a normal phenomenon. 2. Acute gastroenteritis: waking up at 4:00 a.m. to have a bowel movement, accompanied by diarrhea, abdominal pain, etc., may be unhygienic diet, resulting in acute gastroenteritis. 3. Chronic colitis: If you often wake up at four in the morning to have a bowel movement, it may be chronic inflammation of the colon, resulting in long-term irritation of the colon. 4. Irritable bowel syndrome:It may be due to tension, anxiety and other emotions caused by functional bowel disease, causing an increase in intestinal peristalsis, resulting in waking up with abdominal pain and strong bowel symptoms. Wake up at 4:00 a.m. on the stool in the exclusion of physiological causes should go to the hospital, improve the examination to clarify the cause of the disease, according to the cause of the treatment.