The anal cushion is a normal anatomical structure of the human body, and its role is mainly to keep the anus airtight. Under the action of certain factors, such as chronic constipation, because of prolonged straining to defecate, the pressure increases, causing the blood vessels inside to tortuously dilate and the mass to increase, leaving its original position and producing bleeding and/or prolapse, forming hemorrhoids. So hemorrhoids are the downwardly displaced anal cushion tissue. The anal cushion is a normal anatomical structure that can gradually develop into a hemorrhoid. The principle of surgery is to remove the displaced, symptom causing hemorrhoid tissue, then the rest of the anal cushion tissue can still develop into hemorrhoids later in the process. So there is a possibility of recurrence after hemorrhoid surgery. Although there is no way to achieve zero recurrence after surgery, studies have shown that recurrence after hemorrhoid surgery and the need to undergo surgery again is less than 5%, so hemorrhoid surgery is still a safe and effective way to cure hemorrhoids.