Stomach pain in the morning may be caused by indigestion, chronic gastritis, duodenal ulcer, stomach tumor and other reasons. 1. Indigestion: If you eat a lot of food at dinner, stomach peristalsis is slow, and the food stagnates in the stomach, causing bloating and stomach pain. 2. Chronic gastritis: the gastric mucous membrane is damaged, and when you get up in the morning, more gastric acid is secreted, resulting in stomach pain, acid reflux, bloating, belching and other symptoms. 3. Duodenal ulcer: when you get up in the morning on an empty stomach, stomach acid stimulates the ulcer surface, causing abdominal pain, heartburn, nausea, stomach bloating and other symptoms. 4. Stomach tumor: because of the infiltration of cancer cells into tissues, it can manifest as fasting pain, pain after meal, bloating, anemia, lack of appetite and other symptoms. There are other reasons for stomach pain in the morning, such as catching cold in the abdomen, etc. It is recommended to consult doctor in time to find out the cause of the disease and treat it as early as possible.