Functional enteritis is mainly characterized by symptoms such as abdominal pain, diarrhea, constipation or alternating constipation and diarrhea, and these symptoms last for at least three months. It may be caused by mental factors, dietary factors and psychosocial factors. 1. Abdominal pain: Long-term mental stress, emotional anxiety and depression and other mental factors may cause intestinal dysfunction, and abdominal pain symptoms may occur. 2. Diarrhea: Dietary factors such as irregular diet, overeating spicy and stimulating or greasy food can lead to gastrointestinal dysfunction, indigestion and diarrhea symptoms. 3. Constipation or alternating between constipation and diarrhea: Psychosocial factors, such as psychological shadows from car accidents and injuries, can lead to gastrointestinal dysfunction, resulting in constipation or alternating between constipation and diarrhea. If functional enteritis occurs, please consult a doctor in time and follow the doctor’s instructions for medication.