After several years of hemorrhoid surgery, the stool is flat, may be caused by food, anal stenosis, scarring and other conditions, if necessary, can be through the expansion of the anus or surgery and other ways to alleviate the symptoms. 1. Food causes: for example, often eat some soft texture or high moisture content of food, cause fecal deformation of food, such as dragon fruit, bananas, sweet potatoes, milk, etc., can cause flat stool, such as usually pay attention to personal dietary management, flat stool can be transformed over. 2. Anal stenosis: after hemorrhoid surgery, if the recovery is not good, it is very likely to form anal stenosis, when the stool through the anus, it will lead to flat stool or slender. This can be treated by using lubricants and other anal dilation to relieve the symptoms. 3. Keloid hyperplasia: If the patient belongs to the keloid body, after the hemorrhoid surgery, the wound area is very likely to form keloid hyperplasia, the appearance of purple-red hyperplasia, stool through the stool, will become flat. Needs through the surgical cosmetic surgery, the hyperplasia part of the tissue removal. 4. Chronic enteritis: it may be the malabsorption of the intestine or intestinal infection, so that the water content of intestinal feces increases, and the anus can not be completely expanded, causing the phenomenon of flat stools, which can be relieved by oral treatment with drugs such as safranin or haloperidol as prescribed by the doctor. The above situation, the patient should actively consult the doctor, do a systematic examination, first clear the cause of the disease, and then strictly comply with the doctor’s instructions for treatment.