Anal pain with a small amount of stool leakage one month after hemorrhoid surgery may be caused by postoperative complications, such as: anal sphincter damage, nerve damage, the formation of perianal abscess, etc.. 1. The anal sphincter, as its name suggests, is the muscle that controls the act of defecation, and damage to this muscle can lead to abnormal defecation. Hemorrhoid surgery can be divided into internal hemorrhoid surgery, external hemorrhoid surgery, mixed hemorrhoid surgery, the trauma area and depth of the surgery is related to the state of the disease. If the hemorrhoids are severe and the area and depth are too large, the anal sphincter muscle may be mildly damaged during surgery, which may lead to leakage of stool, and require prompt medical treatment. 2. Nerve damage: external hemorrhoids are located in the part of the nerve distribution is more dense, nerve sensitivity is strong, after surgery, easy to damage the relevant nerves, may lead to leakage; in the postoperative nerve recovery phase is longer, and easy to occur nerve hypersensitivity phenomenon, so it is easy to produce anal pain. In this case, it is necessary to consult a doctor in time for standardized treatment. 3. The incidence of perianal abscess is possible, often appearing perianal pain, if the abscess invades the anal sphincter, may occur leakage of stool behavior, this situation requires timely medical treatment. If this situation occurs, please patients timely medical treatment, in the professional doctor’s examination and diagnosis, for reasonable and standardized diagnosis and treatment, to avoid delaying the aggravation of the condition.