A child who frequently passes stool for more than 3 days is called constipated. There are many reasons for constipation, including dietary reasons, such as the child’s preference for meat, vegetables and fruits, or the child’s dislike of water. Some are inconvenient when it is time to have a bowel movement, such as during class, when the rectum has been paralyzed by volume expansion after missing the time, and the defecation reflex or the desire to have a bowel movement disappears. There are also pathological causes, such as an overly long sigmoid colon, or congenital megacolon (lack of neurons in the rectum or colon), a condition that usually requires surgery. Children with chronic constipation will have frequent abdominal pain or bloating, dry stools, difficulty defecating, and even blood in the stool from anal fissures. We also often see hemorrhoids in constipated children in the clinic, the youngest being only a few months old. Therefore, parents should be aware of their child’s stool and seek prompt medical attention if they have frequent abdominal pain or bloody stools. We often encounter children with unexplained abdominal pain, and when we feel the stomach, we find that the stool accumulates in the colon as hard as a stone, and the abdominal pain clears up after an enema or a laxative. If the cause is physiological, i.e. the aforementioned poor diet or bowel habits, it should be corrected promptly. If there are pathological factors, surgical treatment should be given if necessary. Otherwise, long-term colon dilatation and accumulation of feces can lead to intestinal flora imbalance, loss of appetite, developmental delay, and in severe cases, life-threatening enteritis.