Constant diarrhea and stomach pain may be related to food poisoning, intestinal diseases, functional bowel disease and other causes. 1. Food poisoning: Eating food infected by bacteria and other pathogens can cause food poisoning, severe vomiting, abdominal pain and diarrhea and other symptoms. 2. Intestinal diseases: Bacterial dysentery and other infectious diseases caused by bacterial infection can cause abdominal pain, diarrhea and other symptoms under the stimulation of inflammatory factors. 3. Functional bowel disease: such as irritable bowel syndrome, under the influence of mental and psychological factors, abdominal pain, constipation or diarrhea, often accompanied by abdominal distension. There may also be other reasons, such as colon cancer, rectal cancer, etc. It is recommended that people who have diarrhea and stomach pain all the time go to the hospital in time to clarify the cause of the disease and standardize the treatment under the guidance of doctors.