The first thing to find out is the location, time and nature of the pain, whether it is a vague pain or severe pain, whether it is a continuous pain or a burst of pain, whether there is any change in urination or defecation, whether there is any relationship with diet, breathing status and position change, whether there has been a recent trauma and other comprehensive analysis: 1. left upper abdominal pain: common stomach cramps, gastritis and pancreatitis. Gastric cramps or gastritis are usually caused by unclean diet or cold, and the pain is manifested as a burst of episodes in the left upper abdomen, which will be relieved after lying on the side or vomiting. Pancreatitis develops after a full meal and begins with left upper abdominal pain, which later spreads to the whole abdomen and tends to increase continuously, usually accompanied by an increase in body temperature; 2. Right upper abdominal pain: commonly associated with cholecystitis and cholelithiasis. The onset of cholecystitis mostly has chills and high fever, nausea and vomiting, the pain continues to worsen and radiates to the right shoulder, usually after eating greasy food; 3, upper mid-abdomen and periumbilical pain: common in gastric or duodenal ulcer and perforation, enteritis, dysentery, ascariasis, etc.. Perforation can produce severe pain to shock if it causes gastric juice to flow out, and the abdomen is hard like a plate. Ascariasis is common in people with unclean diet, and it is manifested by severe pain like something drilling the top of the upper abdomen, accompanied by nausea and vomiting, and the pain is paroxysmal with no fixed pain point. Enteritis and dysentery are mostly paroxysmal pain, accompanied by abdominal gurgling (increased intestinal sounds), and the pain can be reduced after defecation. Pelvic inflammatory disease is mostly seen in young people, with pressure and rebound pain in the abdomen and increased vaginal discharge. Ovarian tumor torsion has a history of ovarian cysts. Ectopic pregnancy has a history of menopause and can be severe with a drop in blood pressure to the point of shock. There are many causes of sudden stomach pains and the condition is complex, so you should not take painkillers at will before the disease is clarified to avoid masking the symptoms and delaying the diagnosis. There is also a part of pain location atypical stomach pain, such as chest pain or abdominal pain following upper respiratory tract infection, should be considered pneumonia, pleurisy, etc.; patients with angina pectoris may induce epigastric pain after excessive exertion.