Stomach pain and nausea may be caused by mental factors, gastric ulcers, stomach tumor lesions, etc. Treatment can be taken to adjust the daily routine, oral acid-suppressing drugs (such as omeprazole, etc.) and surgical treatment to relieve. 1. Mental factors: stress, tension, depression, anxiety, fatigue and other negative emotions can lead to gastrointestinal stress, manifested as stomach pain, nausea, etc., can be taken to adjust the work and rest, go to bed early and get up early, consult a psychiatrist and other ways to relieve. 2. Gastric ulcers: gastric ulcers destroy the gastric mucosa under the action of gastric acid, so that the gastric mucosa appeared on the ulcer surface of varying sizes, gastric acid can stimulate the ulcer surface, causing reflex pain in the stomach, nausea, vomiting, and so on. For treatment, acid-suppressing drugs such as omeprazole can be used, as well as gastric mucosal protective agents such as magnesium aluminum carbonate. 3. Tumorous lesions in the stomach: Tumorous lesions in the stomach can usually be intervened by means of surgical treatment. There may be other reasons for stomach pain and nausea, so it is recommended to go to the hospital in time and get treatment under the guidance of professional physicians to avoid delaying the condition.