Abdomen is the part between the pelvis and the chest. Abdomen can be divided into upper, middle, and lower abdomen based on 2 horizontal lines, i.e., the line connecting the lowest points of the ribs on both sides, and the line connecting the anterior superior iliac spines on both sides. Abdominal pain refers to pain in the above areas. 1. Gastric, duodenal and pancreatic diseases, mostly pain in the middle and upper abdomen. 2. Cholecystitis, cholelithiasis, hepatitis, cirrhosis, liver abscess, etc. Pain is mostly in the right upper abdomen. 3. Intestinal diseases such as enteritis, intestinal spasms, intestinal tuberculosis, etc. mostly present as pain around the umbilicus. 4. Colonic diseases are mostly in the lower or left lower abdomen, cystitis, pelvic inflammatory pain is mostly in the lower abdomen. 5. The classic presentation of appendicitis is metastatic right lower abdominal pain, starting with pain in the mid-upper abdomen, followed by pain in the right lower abdominal malleolus point. 6. Acute diffuse peritonitis, acute hemorrhagic necrotizing enterocolitis, and mechanical intestinal obstruction tend to be diffuse or abdominal pain of indeterminate location. If the patient’s abdominal pain symptoms are severe or persist without improvement, he should go to the hospital in time, under the guidance of a professional physician for clear diagnosis and treatment.