Stomach pain under stress may be caused by excessive pressure affecting autonomic nerve disorder, stimulating gastric acid secretion or inducing gastritis. The autonomic nerve affects the secretion of gastric acid, the blood flow of the gastric mucosa, and the peristalsis of the stomach. When the pressure is too high, the autonomic nerve function disorder that dominates the stomach will stimulate the secretion of gastric acid to increase, the blood flow of the gastric mucosa will decrease, and the gastric acid will stimulate the gastric mucosa, causing stomach spasm, and then stomach pain will occur. If oneself exists gastritis, gastric ulcer and other diseases, gastric mucosa has damage, excessive pressure, autonomic nerve stimulation of gastric mucosa, resulting in inflammation wounds occurring bleeding, etc., induced gastric diseases, will also appear stomach pain. Excessive pressure to appropriate relaxation, you can shift attention, appropriate exercise, etc. to adjust the mood, reduce pressure, if necessary, you can consult a psychiatrist.