If the hemorrhoid nucleus is less after hemorrhoid surgery, generally do not need to expand the anus; if the hemorrhoid nucleus is more after hemorrhoid surgery to expand the anus, generally expand about 3~6.5 centimeters. If the patient is only 1~2 hemorrhoids in the hemorrhoid surgery, generally speaking does not need to expand the anus, because the hemorrhoids are less, the patient anal sphincter is not much impact. If the patient for mixed hemorrhoids or hemorrhoids more than 2 or more, the patient in the pph surgery or ring mixed hemorrhoid segmental ligation, extremely easy to lead to anal stenosis. Patients with anal stenosis need to have their anus dilated, usually to the width of two fingers, that is, about 3 centimeters, such as too wide easily lead to sphincter relaxation, affecting the normal function of the anus. If the patient after hemorrhoid surgery to expand the anus to about 3 centimeters, still feel difficult to defecate, after palpation anal sphincter muscle tension, you can in the original size of the basis, and then slightly expand the anus to four fingers width, that is, about 6.5 centimeters. The exact width is preferred when the sphincter is relaxed and bowel movements are normal. For patients undergoing hemorrhoid surgery, postoperative anal expansion should be under the professional guidance of the doctor, do not blindly expand the anus.