Chronic and recurrent abdominal pain is more common in children and adolescents, with a prevalence of about 9%-15% in children. In most cases, abdominal pain in children is not serious, and most of them can relieve themselves without treatment. However, frequent and recurrent attacks make parents of affected children very nervous, and some of them even seek medical attention repeatedly. The common causes of abdominal pain in children are described here: 1. Infectious factors, including bacterial, viral and parasitic infections. Bacterial and viral infections are generally more acute abdominal pain. And parasitic infections are mostly recurrent. Among them, roundworm infection is common among parasitic infections. 2, organic lesions of the digestive tract. Common causes are peptic ulcer, inflammatory bowel disease. 3, dietary factors, such as dietary allergies, lactose intolerance. 4.Functional gastrointestinal disease: including functional dyspepsia and irritable bowel syndrome, etc. 5.Abdominal migraine: abdominal migraine is about 5%-6% of the causes of abdominal pain in children, mainly pain in the middle abdomen, which usually lasts about an hour, and is usually accompanied by nausea, headache or sensitivity to light in children. 6.Functional abdominal pain: Some children’s abdominal pain does not fit the diagnosis of IBS, functional dyspepsia or organic disease, and is often diagnosed by doctors as functional abdominal pain. These children often have abdominal pain that interferes with school (absenteeism), and abdominal pain is often triggered by anxiety and stress. 7. Organic lesions of other organs: less common, with urinary tract infections, endometriosis, etc. It is important to tell: if the abdominal pain in the child is if the following conditions occur, it must be systematically diagnosed and treated. ① the child wakes up during sleep because of abdominal pain; ② blood in the stool; ③ severe nausea, constipation, diarrhea, abdominal distension; ④ abdominal pain with pain in the urinary tract or blood in the urine; ⑤ significant abdominal pressure pain