A few days without defecation may be caused by functional constipation, or it may be caused by other disease factors such as anal fissure, complete intestinal obstruction and drug factors. 1. Functional constipation: the etiology is still unclear, and is considered to be related to poor diet, poor defecation habits and lack of exercise, such as inhibition of the urge to defecate, lack of dietary fiber in food, sedentary, bedridden and so on. 2. Other disease factors: anal fissure patients will cause intense anal pain during defecation, resulting in unwillingness to defecate, feces will accumulate in the intestinal lumen for a long time, and the water in the feces will be absorbed, resulting in dry stools, and ultimately defecation difficulties; complete intestinal obstruction of the patient may appear abdominal pain, abdominal distension, stop defecation and exhaust situation. 3. Drug factors: taking morphine, chlorpromazine and other drugs can also cause constipation. When constipation occurs and cannot be eliminated after lifestyle intervention, it is recommended to go to the hospital for consultation, clarification of the cause of the disease and standardized treatment.