Sudden stomach pain and nausea may be caused by improper diet or reflux esophagitis, gastritis, pancreatitis or cholecystitis, which can be treated according to different causes. A. Inappropriate diet may be related to eating too fast, overeating, eating cold and stimulating food, patients should pay attention to adjusting their eating habits, chewing slowly, eating less and more meals, paying attention to dietary hygiene, avoiding cold and spicy stimulating diet. In addition, attention should be paid to exclude the consumption of toxic or expired food, because the consumption of such food can also cause sudden stomach pain, nausea, vomiting and other symptoms, it is recommended to consult a doctor in a timely manner. Second, disease factors 1, reflux esophagitis: delayed emptying of gastric contents, abnormal lower esophageal sphincter, resulting in regurgitation of gastric acid and gastric contents into the esophagus causing nausea, vomiting, upper abdominal discomfort, which patients mistake for stomach pain. Proton pump inhibitors can be taken under the guidance of a doctor to reduce the secretion of gastric acid, you can also take magnesium aluminum carbonate, aluminum hydroxide and other drugs to neutralize gastric acid and relieve symptoms; 2, gastritis: gastritis patients may stimulate the gastric mucosa when eating, will suddenly feel stomach pain, some patients may also be accompanied by nausea, vomiting and other symptoms. The use of drugs to reduce the concentration of gastric acid, promote gastric power, eradicate Helicobacter pylori and protect the gastric mucosa can relieve stomach discomfort; 3, pancreatitis: pancreatitis is mostly acute inflammation in the clinic, if often eat greasy food, may induce pancreatitis, nausea, stomach discomfort. Acute attack period, patients need to temporarily fasting fasting, gastrointestinal decompression, and at the same time can follow medical advice to give parenteral nutrition support to relieve symptoms; 4, cholecystitis: mainly seen in chronic cholecystitis, patients will appear burning stomach, dull pain, nausea, vomiting and other symptoms, patients should promptly go to the hospital for examination, such as routine blood, ultrasonography, abdominal X-ray, etc., can follow medical advice to take magnesium sulfate to relieve symptoms.