Foreign body sensation after hemorrhoid surgery may be caused by postoperative edema, postoperative thrombosis and wound hyperplasia. 1. Post-operative edema: hemorrhoid surgery is to ligate the enlarged hemorrhoidal nuclei or bleeding hemorrhoidal nuclei, other hemorrhoidal areas around the blood flow may not return, the perianal area may be edema, and sometimes the patient will also be accompanied by a foreign body sensation in the anus. Patients can take a sitz bath with warm water or 1:5000 potassium permanganate solution after bowel movement, which can relieve the discomfort. 2. Postoperative thrombus: It is mainly due to the obstacle of blood running in the local wound after surgery, which leads to the accumulation of blood, thus making the patient have a foreign body sensation in the anus. Patients can use Ma Yinglong musk hemorrhoid cream, anus tai suppository and other drugs under the guidance of the doctor to ease the discomfort. 3. Wound hyperplasia: some patients in the hemorrhoid surgery, due to high anal canal muscle tone or spasm of the internal sphincter, can cause anal wound local blood and lymphatic reflux obstacles, increased vascular permeability, leading to the deterioration of the normal environment for the growth of the granulation, resulting in necrosis of the tissue cells or wound hyperplasia, which makes the patient in the postoperative period of 8 months has been a foreign body sensation. If the wound hyperplasia is serious, surgical resection can be performed again. Feeling of foreign body sensation after hemorrhoid surgery should immediately seek medical treatment under the guidance of a physician