Patients bleed when they are forced to stool, the causes include hemorrhoids, anal fissures, rectal tumors, etc., as follows: 1. Hemorrhoids: Hemorrhoids are the most common disease of the rectal perineum, mainly manifested as blood dripping after defecation, and fresh blood. If it is an external hemorrhoid, there will also be pain after defecation, especially when it is a thrombosed external hemorrhoid, the pain is more obvious. 2.Anal fissure: bleeding when stool exertion may also be due to anal fissure, generally the bleeding in this case is not very large, but accompanied by obvious severe pain, and spasmodic pain, relatively long. 3.Rectal tumor: bleeding when stool exertion is likely to be caused by rectal tumors, such as rectal cancer, colonic polyps, etc. If you find bleeding when straining stool, it is recommended that you go to a regular specialized hospital for systematic examination in a timely manner, and then carry out symptomatic treatment according to different causes after a clear diagnosis.