blood i n stool may due to Diverticular disease. Diverticula are small pouches that project from the colon wall. Usually diverticula don t cause problems, but sometimes they can bleed or become infected. Anal fissure . A small cut or tear in the tissue lining the anus similar to the cracks that occur in chapped lips or a paper cut. Fissures are often caused by passing a large, hard stool and can be painful. Colitis . Inflammation of the colon. Among the more common causes are infections or inflammatory bowel disease. Angiodysplasia. A condition in which fragile, abnormal blood vessels lead to bleeding. Peptic ulcers . An open sore in the lining of the stomach or duodenum, the upper end of the small intestine. Many peptic ulcers are caused by infection with a bacterium called Helicobacter pylori (H. pylori). Long-term use or high doses of anti-inflammatory drugs such as aspirin, ibuprofen, and naproxen can also cause ulcers. Polyps or cancer. Polyps are benign growths that can grow, bleed, and become cancerous. Esophageal problems. Varicose veins of the esophagus or tears in the esophagus can lead to severe blood loss. Bright red blood or maroon-colored stools usually indicate a problem in the lower part of the digestive tract such as hemorrhoids. to stop blood you can use phosphorus 200 pills on sos basis ....blood will come down with in 2-3 days. after that go for clinical evaluation. what ever the problem may we can treat by homeopathy with out side effects. Dr Rajashekar