Stomach pain and nausea need to consider dietary, medication and disease causes. Dietary causes include eating irritating foods, irregular diet, etc.; medications include non-steroidal anti-inflammatory drugs, hormones, etc.; and diseases include gastritis, peptic ulcer, gastrointestinal masses, etc. 1. Dietary causes: for example, eating irritating foods such as chili and mustard can stimulate the gastrointestinal tract, resulting in stomach pain, nausea and other symptoms; irregular diet can affect gastrointestinal peristalsis and digestion, resulting in nausea, bloating and other symptoms, or even stomach pain, acid reflux and other symptoms. 2. Drug reasons: such as taking non-steroidal anti-inflammatory drugs, hormones, etc., can damage the gastric mucosa, discomfort symptoms. 3. Disease causes: such as inflammation of the stomach and duodenum can have acid reflux, heartburn and other symptoms; such as peptic ulcer can have rhythmic gastroparesis, that is, gastric ulcers can have stomach pain after meals, duodenal ulcers can have hunger pains and abdominal pain, etc.; such as gastrointestinal tract swelling can have symptoms of lethargy, fatigue and so on. It is recommended that patients with symptoms of stomach pain and nausea go to the hospital in a timely manner, complete the relevant examinations, make a clear diagnosis and active treatment.