Stool, colonoscopy is normal, no hemorrhoids, after the stool on the anus has a sense of falling and hot feeling may be due to peritoneal irritation, pelvic floor occupying lesions, anorectal lesions and other factors. 1. Peritoneal irritation: when abscesses and effusions appear in the pelvis and intestines, they will stimulate the rectal tissues to produce anal swelling and burning sensation in the anus, such as ectopic pregnancy, purulent appendicitis and so on. 2. Pelvic floor occupying lesions: uterine tumors, ovarian tumors, abdominal tumors and other occupying lesions in the pelvic floor may stimulate the rectum, resulting in anal distension and burning sensation after defecation. 3. Reproductive system lesions: prostatitis, prostate hyperplasia and other diseases can also stimulate the rectal tissue, resulting in anal swelling and burning after defecation. It is recommended that patients go to a regular hospital in time to improve the systematic examination, identify the cause of the disease, under the guidance of the physician to carry out reasonable standardized treatment.