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- Patient Comments: Blood in the Stool - Experience
- Patient Comments: Blood in the Stool - Causes
- Patient Comments: Blood in the Stool - Treatment
- Patient Comments: Blood in the Stool - Hemorrhoids
- Patient Comments: Blood in the Stool - Anal Fissures
- Patient Comments: Blood in the Stool - Diseases Causes
- Patient Comments: Blood in the Stool - Associated Symptoms
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- Rectal bleeding (blood in stool) facts
- What does rectal bleeding (blood in stool) mean?
- What are causes of blood in the stool (rectal bleeding)?
- What diseases and conditions can cause blood in the stool (rectal bleeding)?
- Anal fissures
- Colon cancer and polyps
- Colitis and proctitis
- Meckel's diverticulum
- Rare causes of rectal bleeding
- What kind of doctor treats rectal bleeding?
- When should I call a doctor for blood in the stool (rectal bleeding)?
- How is the cause of blood in the stool (rectal bleeding) diagnosed?
- History and physical examination
- Flexible sigmoidoscopy
- Radionuclide scans
- Visceral angiogram
- Video capsule and small intestine endoscopy
- MRI and CT tomographic angiography
- Nasogastric tube aspiration
- Blood tests
- What is the treatment for rectal bleeding (blood in the stool)?
- Can rectal bleeding (blood in the stool) be prevented?
- What is the prognosis of rectal bleeding (blood in the stool)?
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What diseases and conditions can cause blood in the stool (rectal bleeding)?
Many diseases and conditions can cause rectal bleeding. Common causes include:
- Anal fissures
- Cancers and polyps of the rectum and colon
- Abnormal blood vessels in the lining of the intestines (angiodysplasia)
- Ulcerative colitis
- Ulcerative proctitis
- Crohn's colitis
- Infectious colitis
- Ischemic colitis
- Meckel's diverticula
As discussed previously, it also is possible for "rectal bleeding" to be coming from the stomach and duodenum, primarily from ulcers, cancers, and angiodysplasias.
An anal fissure is a fairly common, painful condition in which the lining of the anal canal is torn. An anal fissure usually is caused by physical trauma due to constipation or a forceful bowel movement through a tight anal muscle or physical trauma also may be contributing factors. Once the skin is torn, each subsequent bowel movement can be painful, and the pain often is severe. The amount of bleeding that occurs with an anal fissure is small and usually is noticed in the toilet bowl or on the toilet paper as bright red in color. The symptoms of an anal fissure are commonly mistaken for hemorrhoids, but hemorrhoids generally do not cause pain with bowel movements.
Hemorrhoids are masses or clumps ("cushions") of tissue within the anal canal that contain blood vessels. Although most people think hemorrhoids are abnormal, they are present in everyone. It is only when the hemorrhoidal cushions enlarge that hemorrhoids become susceptible to trauma from passing stool and cause problems (such as bleeding or anal discomfort) and are considered abnormal or a disease. Like anal fissures, bleeding from hemorrhoids usually is mild and does not cause anemia or low blood pressure. Rarely, a person may develop iron deficiency anemia as a result of repeated hemorrhoidal bleeding over several months to years, especially if the dietary intake of iron is low.