What is it that suddenly pulls out a lot of blood?

Hemorrhoids bleeding is most common when defecating. Hemorrhoids are generally intermittent painless and bleeding or even ejection as the main symptom. Serious hemorrhoids will be accompanied by anal prolapse, bright red color, more or less hematochezia, blood stool separation, and bleeding after defecation. It may also be anal fissure bleeding, generally accompanied by anal tearing pain, bleeding color bright red, and the amount is mostly small. In addition, it may also be caused by ulcerative colitis, proctitis, colorectal tumors, polyps, etc. Most of the bleeding in these diseases is dark red in color, accompanied by changes in stool habits or mucus stools. Therefore, patients showing hematochezia should go to the hospital in time to see a doctor, clarify the cause of hematochezia and then take corresponding treatment.