The diarrhea is usually considered to be related to unhygienic diet and some diseases, some patients may have watery stools, accompanied by other symptoms such as vomiting. 1, unhygienic diet: first of all, consider whether the consumption of unclean food or cold food, stimulating the gastrointestinal tract mucosa thus appearing diarrhea, abdominal pain. Daily should pay extra attention to dietary hygiene, eating unclean food, cold and stimulating food, etc., the above symptoms may appear; 2, acute gastroenteritis: the more common infectious bacteria causing acute gastroenteritis include dysentery bacillus, salmonella, E. coli, etc., mainly manifested as diarrhea, abdominal pain, vomiting, etc., diarrhea is the most common symptom, can appear after meals. It should be promptly treated with sensitive antibiotics under the guidance of doctors. 3. Organic diseases: such as tumors of gastrointestinal tract, nausea, vomiting, diarrhea, mostly dilute stools, are common manifestations of gastric tumors. It may also be diseases of other systems outside the gastrointestinal tract, such as hyperthyroidism, which may also present with the need to poop after eating, increased number of bowel movements and stomach pain. Treatment should be carried out according to the etiology, including medication and surgery; 4. Others: such as enteric neurological function disorder, irritable bowel syndrome, etc., can also make patients show the performance of painful diarrhea after eating, which should go to the hospital and be treated after clear diagnosis.