After 20 days of anal fissure excision surgery, anal tightness after defecation may be caused by scar formation due to the dysfunction of one’s own sphincter muscle. For this kind of anal fissure resection surgery, 24 days later, the patient will feel tight anus after defecation, usually consider that the patient in the anal fissure resection surgery will be their own sphincter partially damaged, resulting in their own sphincter dysfunction after the repair of sex fibers. Patients will feel their anus tight after defecation, for this situation can be guided by professional doctors to use fingers to expand the anus after the operation, and at the same time, patients can use some medicines, such as Keserol to help their defecation. Patients with the above situation, it is recommended to consult the anorectal department of the hospital in a timely manner, according to the specific conditions of the professional doctor’s advice, the above views are for reference only treatment.