The common causes of abdominal pain are intussusception and intestinal spasm. The most common causes of abdominal pain in children are acute appendicitis, acute gastroenteritis, mesenteric lymphadenitis, intestinal spasm, constipation and diet. 1, intussusception: abdominal pain for paroxysmal regular episodes, manifested as a sudden onset of severe paroxysmal colic, the child cries more than, bending knees and shrinking abdomen, pale, lasting a few minutes or more after the abdominal pain relief, quiet or sleep, after an interval of 10-20 minutes along with intestinal peristalsis appears to have repeated episodes. 2, intestinal cramps: infants are common, can appear recurrent episodes of paroxysmal abdominal pain, abdominal distension is obvious, usually relieved after exhaustion and defecation. 3, intestinal roundworm disease: at this time the child’s abdominal pain location is not fixed, the child has paranoia, heterophagia, nausea, vomiting and other symptoms of digestive system disorders, sometimes there will be systemic allergic symptoms, need to go to the hospital to check the stool and worm eggs. 4, gastritis: acute gastritis has a rapid onset, patients only have mild loss of appetite, abdominal pain, nausea, vomiting, serious cases may appear vomiting blood, black stool, dehydration and electrolyte disorders. 5, appendicitis: appendicitis abdominal pain characteristics of the site of pain can change, at first the location of abdominal pain is the upper abdomen and around the umbilicus, about seven or eight hours, it will shift to the right lower abdomen, the location of the right lower abdomen iliac anterior superior spine and the outer third of the belly button line. 6, mesenteric lymphadenitis: the earliest symptom of mesenteric lymphadenitis is abdominal pain, which is common in the right lower abdomen because the lesion mainly attacks a group of lymph nodes in the terminal ileum. Acute mesenteric lymphadenitis should be considered when the child has clinical fever, abdominal pain, vomiting with upper respiratory tract infection, or occurs after intestinal inflammation, without abdominal muscle tension. 7, constipation: when the baby’s stool begins to form, the most common cause of baby tummy pain is constipation. If you find that your baby has less bowel movements than usual, especially if your baby has not had a bowel movement for more than 3 days and has a painful expression when having a bowel movement, then it is likely to be constipation. 8, food allergies: food allergies can cause nausea, vomiting and abdominal pain and diarrhea. If the baby’s stomach pain and accompanied by bloody stools or rash, it is likely to be food allergies. This is the time to get medical attention. 9, allergic purpura: there are paroxysmal abdominal pain, vomiting, blood in the stool, due to edema, bleeding, thickening of the intestinal canal, sometimes the left lower abdomen can be palpable mass, but the majority of children have a hemorrhagic rash, joint swelling and pain, some children have protein urine and hematuria. In conclusion, there are many causes of tummy pain in children, such as mesenteric lymphadenitis, acute enteritis, gastritis, pancreatitis, appendicitis, intussusception, intestinal obstruction, intestinal torsion, food poisoning, chronic lead poisoning, allergic purpura, cold and flu, unclean diet, after overeating, etc. Parents should pay attention to the severity of tummy pain in children, if it is accompanied by diarrhea, vomiting, fever, severe pain, cold sweat, mental depression, etc., they should take the child to the hospital promptly. If the pain is accompanied by diarrhea, vomiting, fever, severe pain, cold sweat, mental discomfort, etc., the child should be sent to the doctor.