The main causes of morning stomach pain include cold stomach, food irritation, peptic ulcer, gastritis, etc. The main causes of morning stomach pain include cold stomach, food irritation, peptic ulcer, and gastritis. 1. Cold stomach: When the temperature in the room is too low during the night sleep, the stomach gets cold, and the muscle tissues in the stomach get stimulated and spasm, which may lead to the symptom of stomach pain in the morning. 2. Food irritation: Eating spicy, cold and greasy food will damage the gastric mucosa, and also affect the function of the gastrointestinal tract, resulting in indigestion, which can lead to morning stomach pain. 3. Peptic ulcer: Suffering from peptic ulcer disease, such as gastric ulcer, duodenal ulcer, etc., excessive secretion of gastric acid at night, so that the ulcerated surface of the gastric mucosa is stimulated, resulting in the appearance of pain. 4. Gastritis: Suffering from inflammation of the stomach, such as: chronic superficial gastritis, atrophic gastritis, etc., the mucous membrane of the stomach is damaged, the inflammation stimulates the damaged gastric mucous membrane, which will lead to the symptoms of morning stomach pain. The above symptoms, must promptly consult a doctor to clarify the cause, to take targeted treatment measures, do not miss the condition.