What is the cause of frequent blood in stool? There are many causes of blood in stool, such as rectal bleeding, such as rectal cancer, rectal damage, hemorrhoids, anal fissure; upper gastrointestinal bleeding; small intestinal bleeding, such as intestinal tuberculosis, restricted enteritis, acute hemorrhagic necrotizing enteritis, small intestinal tumor, intestinal overturning, etc. Colon bleeding, such as dysentery, ulcerative colitis, restricted enteritis, colon cancer, etc.; other diseases, such as various blood diseases, epidemic hemorrhagic fever, typhoid and paratyphoid fever, hookworm disease vitamin deficiency, etc. What are the diseases that cause it? 1, internal hemorrhoids, mixed hemorrhoids This is a common cause of fecal bleeding, blood in the stool usually occurs during or after defecation, in the form of dripping or spraying blood, bright red blood, blood and stool do not mix, sometimes accompanied by swelling prolapse. 2, colon lesions colon polyps, colon cancer, ulcerative colitis, dysentery, etc., can also cause blood in the stool, mostly in the stool mixed with mucus or appear pus and blood stool. Sometimes it is accompanied by abdominal pain, fever, and urgency. Rare diseases, such as intestinal tuberculosis, intestinal loop, also have blood in the stool symptoms. 3, anal fissure Blood is bright red, dripping or blood after wiping with hand paper, and there is severe anal pain during or after defecation. 4, rectal lesions Rectal polyps are benign tumors of the intestine, often with blood in the stool, sometimes the masses come out of the anus, mostly in children, middle-aged and elderly people. If there is continuous blood in the stool, a feeling of falling, frequent stools, and short-term weight loss, rectal cancer should be excluded. 5.Anal fistula Blood in stool is small, often mixed with feces, pus and blood-like or pus and mucus-like stool, bright red, frequent stool, feeling of urgency and pressure pain in the left lower abdomen, accompanied by abdominal pain, diarrhea, nausea and vomiting. 6.Proctal cancer bleeding Traditional surgery for bowel cancer often involves cutting the anal canal and rectum in one stroke, and patients can only rely on artificial anus for maintenance.