Sudden abdominal pain in the morning can be seen in a variety of diseases, such as gastrointestinal dysfunction, duodenal ulcer, appendicitis and so on. 1. Gastrointestinal dysfunction: it can be caused by improper eating, heredity and other factors. The main symptoms include abdominal pain, diarrhea or constipation. Abdominal pain may be caused by abnormal gastrointestinal peristalsis after eating improperly the night before or getting cold in the abdomen. 2. Duodenal ulcer: It can be caused by Helicobacter pylori infection and alcohol consumption. The main symptom is recurrent abdominal pain during fasting. 3. Appendicitis: an inflammatory disease of the appendix, which can be caused by bacterial infection, improper diet and other factors. The main symptoms can be seen as metastatic right abdominal pain, nausea and vomiting. Appendicitis can also cause sudden abdominal pain in the morning. If you have sudden abdominal pain in the morning, you should go to the hospital in time for relevant examinations to clarify the cause of the disease and actively cooperate with the doctor’s treatment.