Waking up in the morning with diarrhea may be physiological reasons, due to improper eating or cold, or pathological reasons, such as acute gastroenteritis, inflammatory bowel disease and so on. 1. Physiological reasons: eating cold, spicy and stimulating, greasy food the night before can stimulate the mucosa of the gastrointestinal tract, causing indigestion, gastrointestinal peristalsis abnormalities, leading to symptoms of diarrhea in the morning. 2. Acute gastroenteritis: the food eaten the night before is not hygienic, which can lead to pathogenic bacteria into the gastrointestinal tract to cause infection, including viruses, bacteria, etc., damage to the mucous membrane of the gastrointestinal tract, which can lead to the symptoms of diarrhea in the morning. 3. Inflammatory bowel disease: ulcerative colitis, Crohn’s disease and other inflammatory bowel disease, chronic course, often recurring, difficult to cure, intestinal mucosal ulceration, crypt abscess, congestion, bleeding and other changes, can be manifested in the morning to get up and have diarrhea symptoms. If you get up in the morning with diarrhea, after excepting physiological causes, you should go to the hospital, under the guidance of the doctor to check and treat.