Men who find blood on the hand towel after a bowel movement may have hemorrhoids and anal fissures as common causes. Most of the blood on the hand towel after bowel movement comes from the anorectal area. Gastrointestinal bleeding above the anorectal area is most often manifested as blood in the stool or black stool. The most common causes of bleeding in the anorectal area are hemorrhoids and anal fissures. Hemorrhoidal bleeding may be manifested as blood dripping from the stool, etc. It may be accompanied by prolapse of a swelling in the anus, and may be painful in the case of thrombosed hemorrhoids. Anal fissure in the bleeding at the same time, there will be severe pain in the anus, can be aggravated during defecation, and may even cause constipation because the pain is too intense. In addition to hemorrhoids and anal fissures, tumors and other diseases may also cause blood on the handkerchief after defecation, so it is recommended to go to the hospital in time when there is blood in the stool and other abnormalities.