There are many causes of gastrointestinal dysfunction, such as psychosomatic factors, dietary factors, genetic factors, and abnormal autonomic function. 1. Psychosomatic factors: For example, functional dyspepsia, irritable bowel syndrome and functional constipation are all related to anxiety and depression and other psychosomatic factors. 2. Dietary factors: prolonged poor dietary habits, such as overeating, may also cause gastrointestinal dysfunction showing intolerance to certain foods. 3. Genetic factors: for example, irritable bowel syndrome has a certain tendency to develop in families. 4. Autonomic function abnormalities: some patients with gastrointestinal dysfunction and vagus nerve function abnormalities, such as diarrhea patients will show increased vagal activity, constipation patients show reduced vagal activity. Patients with gastrointestinal dysfunction need to seek timely medical attention and systematic guidance under the guidance of a doctor.