Tummy pain is a symptom of abdominal pain caused by various causes of diseases inside and outside the abdominal cavity. It can be divided into acute and chronic, with complex etiologies such as inflammation, tumor, obstruction, bleeding, dysfunction, etc. The age group and gender of abdominal pain are different, and the common diagnosis of the disease is also different. The causes of abdominal pain in childhood include mesenteric lymphadenitis, intussusception, ascariasis and so on, which can be combined with clinical symptoms and ultrasound examination and can generally be diagnosed clearly. 2, young adults appear abdominal pain mostly gastroduodenal ulcer, gastroenteritis, pancreatitis, such as gastric ulcer pain aggravated after meals, duodenal ulcer pain aggravated by fasting and alleviated after meals, overeating and drinking alcohol easily lead to the occurrence of pancreatitis. 3, middle-aged and elderly people abdominal pain mostly caused by gallstones, cholecystitis, digestive system tumors and myocardial infarction and other diseases, need to be based on ultrasound and gastroscopy, electrocardiogram and other comprehensive diagnosis. 4, women with abdominal pain should consider whether there is ovarian cyst torsion, ruptured corpus luteum cyst, etc. If they are of childbearing age, they should consider whether there is ectopic pregnancy, and doing ultrasound examination can generally make a clear diagnosis. Therefore, the symptoms of stomach pain appear first according to age and pain location, make a preliminary diagnosis, and make a clear diagnosis according to the comprehensive judgment of imaging examination and laboratory examination.