The flat stool after hemorrhoid surgery is usually caused by improper diet, intestinal dysfunction, local wound inflammation and swelling. 1. Improper diet: improper diet after surgery will stimulate the wound, resulting in narrowing of the lumen of the intestinal tube, resulting in flat stools, the patient’s diet should be light, prohibit spicy and stimulating food, drink more water, while eating some high-fiber foods. 2. Intestinal dysfunction: after hemorrhoid surgery, patients will generally slow down peristalsis, while the intestinal tract accumulates more gas, which makes the patient’s digestive function problems, resulting in flat stools. 3. local wound inflammation and swelling: local wound inflammation and swelling generally indicates that the wound is infected by bacteria, there will be swelling around it, which will lead to the stool in the case of extrusion to become flat. If you have a flat stool after hemorrhoid surgery, it is recommended that you go to the hospital to find out the cause of the disease under the guidance of the doctor and actively cooperate with the treatment to avoid delaying the condition.