Internal hemorrhoids tend to develop in the 3, 7, and 11 o’clock truncated position. The three points above are parallel to the rectal vein flexion, called the built-in venous plexus,which is easy to expand. The three built-in venous plexus deposition areas, if the internal hemorrhoids in other parts continue to develop, may fuse and connect with the internal hemorrhoids in the parent hemorrhoid site, forming a circular internal hemorrhoid. Internal hemorrhoids are one of the most common anorectal diseases, with 3, 7, and 11 o’clock excisions being the most common. The main symptoms of hemorrhoids are painless, intermittent bleeding after going to the bathroom, small amounts of dripping blood, or jets. Long-term chronic bleeding can cause chronic anemia. Internal hemorrhoids gradually increase and prolapse out of the body from the anus during early stool, aggravated by spontaneous anal prolapse during coughing, prolonged standing or other conditions, requiring hand retraction or retraction followed by descent. Sometimes internal hemorrhoids are located outside the anus and even cause swelling and necrosis. Internal hemorrhoids usually occur at 3, 7 and 11 points of the truncus position.