Too tight anus by medication and anal dilation. Commonly caused by common symptoms after anal surgery, if it does not affect defecation, the problem is not very big. Those causing defecation difficulties need to be treated early by using some Chinese herbal medicine decoction boiled and fumigated on the anus to promote local blood circulation and facilitate wound healing. Pay attention to anal cleanliness and hygiene as well as infection affecting wound healing, and use antibiotics under the guidance of the doctor. Regular anal dilatation is needed 2-3 weeks after surgery, 2-3 times a day for 10-15 minutes each time to prevent anal stenosis. Eat a light diet, drink more honey water, eat more fruits, do not eat pepper, exercise properly and prevent constipation.