For people who have had anal surgery, the anus becomes tight and small, can be treated by expanding the anus, generally can be restored. At present, after anal surgery, due to the healing of the scar formed by the large surgical incision, and then scar contracture, resulting in the narrowing of the anus, which leads to the emergence of such a group of people have difficulty in defecation, stool thinning and other clinical symptoms. For this group of people, anal dilatation is often used in the clinic to eliminate the symptoms of anal shrinkage and restore normal defecation. Anal dilation is usually carried out about 2 weeks after the operation, and anal dilation treatment will have obvious effect in about 1 month, but the specific situation varies from person to person. Anal expansion should be gradual, operated by professional doctors, that is, from one finger gradually expand to three fingers, to be expanded to about 3cm for the best, that is, two fingers into the anus without tightness. For the people with the above situation, it is recommended to go to the hospital anorectal department in time to follow the doctor’s instructions for treatment, so as not to delay the condition.