Frequent abdominal pain and diarrhea may be caused by irritable bowel syndrome, intestinal flora imbalance, chronic gastroenteritis, ulcerative colitis and other reasons. 1. Irritable bowel syndrome: emotional excitement, frequent anxiety, depression, overwork and other factors can trigger irritable bowel syndrome, which is mainly manifested as lower abdominal pain, diarrhea, frequent exhaust and other symptoms. 2. Intestinal flora imbalance: excessive reproduction of harmful intestinal bacteria can lead to abdominal pain, diarrhea, bloating and other symptoms. 3. Chronic gastroenteritis: chronic inflammation of the gastrointestinal tract can cause abdominal pain, usually around the navel, accompanied by diarrhea and other symptoms. 4. Ulcerative colitis: the cause of the disease is complex, due to chronic non-specific inflammation of the colon can lead to frequent abdominal pain, diarrhea, mucus, pus and blood stools and other symptoms. Frequent abdominal pain, diarrhea may also be related to other causes, it is recommended to seek medical advice as soon as possible, under the guidance of the physician to identify the cause of the disease, and treatment.