Abdominal pain in children is indeed very common, and we clinically classify abdominal pain in children into medical abdominal pain and surgical abdominal pain. Internal abdominal pain refers to intestinal spasms caused by various reasons, which are “functional”. Examples include diarrhea, abdominal cold, allergies, even fever, respiratory infections, etc. Surgical abdominal pain, on the other hand, generally refers to abdominal pain caused by organic lesions in the abdomen, or what we often call “acute abdomen”. Pediatric acute abdominal disease is an abdominal emergency with abdominal pain as the main manifestation, which mostly requires surgical treatment. Acute abdominal disease is not a specific disease, but a large group of diseases. We artificially divide acute abdominal disorders into three major categories: 1, intestinal obstruction: various causes of gastrointestinal obstruction. Intestinal obstruction in children can be congenital or acquired. Congenital intestinal obstruction is caused by congenital developmental abnormalities or malformations. Examples include congenital intestinal atresia, intestinal stenosis, congenital megacolon, intestinal malrotation, Meckel’s diverticulum, etc. Some of these conditions present with symptoms at birth and require immediate surgery, while others develop in infancy, or older. The most common diseases of acquired intestinal obstruction are intussusception, intestinal adhesions, inguinal hernia, etc. 2. Inflammation of abdominal organs: common diseases include appendicitis, pancreatitis, cholecystitis, small bowel colitis, Meckel’s diverticulitis, etc. 3, peritonitis: there are sudden onset, more often from the above diseases are not treated in time to develop peritonitis. Symptoms of pediatric acute abdominal disease manifestation with the disease itself, and the degree of disease progression. The common symptoms are: abdominal pain, bloating, vomiting, fever, constipation, and blood in the stool. Abdominal pain is usually the earliest symptom, and it is important to note that abdominal pain in children is often manifested as crying because they cannot speak. Surgical abdominal pain is different from internal abdominal pain, which is usually mild and can be relieved by itself after a while. Surgical abdominal pain is usually persistent, with some paroxysmal exacerbations. Therefore, once you find that your child has severe abdominal pain that does not resolve, vomiting, abdominal distention, fever, or abnormal stools, it is likely that there is a surgical problem, and you should go to a pediatric hospital promptly. Pediatric appendicitis is very common in adults, but the incidence of appendicitis in children is also very high. It presents with abdominal pain, fever, vomiting, pressure in the right lower abdomen, elevated white blood cells, and a thickened appendix that can be detected by ultrasound. However, it is easy to misdiagnose clinically because infants and children cannot express themselves, cannot cooperate with the examination, and the disease progresses quickly (perforation in a few hours). The appendix soon becomes septic and perforated, forming peritonitis, abdominal abscesses, intestinal adhesions, and even causing sepsis and infectious shock, which is life-threatening. So don’t think that pediatric appendicitis is a minor disease; we sometimes have a lot of trouble dealing with appendicitis. Intussusception in children is also a very common disease, mostly occurring in infants between 4 and 10 months of age. The 4 main symptoms are: paroxysmal abdominal pain (crying), vomiting, blood in the stool, and abdominal masses. Early treatment of intussusception is simple, air enema; if not diagnosed in time, more than 48 hours requires surgery and intestinal necrosis, severe dehydration, and shock may occur.