Not being able to defecate for three days may be caused by constipation or intestinal obstruction, and the patient can be treated with dietary adjustment, medication and surgery. 1. Dietary adjustments: When patients suffer from constipation, it may lead to the inability to defecate for three days, at this time, patients can adjust their diets to alleviate the problem, and they can consume foods rich in fiber, such as celery, leeks and so on. 2. Medication: If the constipation is more serious or long-term constipation, resulting in the patient can not defecate for three days, you can consider the use of medication under the guidance of the doctor, you can use drugs to promote intestinal peristalsis, such as mosapride; you can also use drugs to regulate intestinal bacteria, such as bifidobacteria, etc., can be a good treatment for constipation. 3. Surgical treatment: If the patient can not defecate for three days and accompanied by other symptoms, such as inability to pass gas, abdominal distension and abdominal pain, etc., it can be considered whether intestinal obstruction occurs, and if intestinal obstruction occurs, it needs to be treated surgically to release the obstruction. When the patient does not poop for three days, it is best to go to the hospital for examination and treatment for the symptoms to ensure good health.