Diarrhea after breakfast may be caused by chronic gastroenteritis, irritable bowel syndrome, improper diet and other factors. 1. Chronic gastroenteritis: many patients with abdominal cold or unclean diet leads to diarrhea after breakfast, manifested as diarrhea, abdominal pain, acute and severe (lower abdomen is uncomfortable, very want to relieve stools, defecation after a feeling of incomplete) and other discomforts. It is recommended that patients go to the hospital in time through the routine examination of stool, once the patient is diagnosed with chronic gastroenteritis, it is recommended that under the guidance of the doctor oral spleen and intestinal pills, levofloxacin tablets and other medications. 2. Irritable Bowel Syndrome (IBS): The symptoms of patients are diversified, and some of them are mainly characterized by hyperactive bowel movements. After eating breakfast, some patients may have diarrhea due to the stimulation of the intestines caused by food, and the intestines need to excrete the food quickly. It is recommended that patients improve their symptoms by promoting gastric power drugs, such as domperidone and mosapride. 3. Improper diet: many people choose to drink milk for breakfast, for those who have lactose intolerance, after drinking milk, there may be a bowel movement after breakfast, due to the thin feces, mistaken for diarrhea. It is recommended that patients should control their diet during the treatment period, try to maintain a light diet, do not eat cold, spicy food. If repeated diarrhea after breakfast, hospitalization is recommended.