Causes of Rectal Bleeding

Rectal bleeding or blood in stool can result from anorectal disorders, gastrointestinal bleeding, or from infectious causes of bloody diarrhea.

Anorectal Disorders: Some causes of rectal bleeding due to disorders of the rectum or anus include:

  • Hemorrhoids (thrombosed)
  • Internal hemorrhoids (rectal hemorrhoids)
  • Anal fissure
  • Anorectal fistula
  • Proctitis
  • Rectal injury (e.g. sexual activity; abuse)
  • Rectal polyp
  • Rectal cancer
  • Rectal melanoma
  • Rectal ulcer (Ulcerative proctitis)
  • Invasive diagnostic test injury (e.g. colonoscopy, proctosigmoidoscopy)

Infections and Bloody Diarrhea: Various infections can cause blood in stool, and often also cause bloody diarrhea as a severe type of rectal bleeding. Some examples include:

Read more about: Causes of Bloody Diarrhea.

Gastrointestinal Bleeding: Anorectal bleeding can result from internal bleeding in the gastrointestinal tract. Causes include:

Exacerbating Disorders: certain diseases may exacerbate or trigger bleeding from a peptic ulcer or other digestive bleeding condition, such as:

Blood in Vomit: Various causes of blood in vomit, such as bleeding of the esophagus or stomach, can also result in blood in stool. Read more about: Vomiting Blood.

Bleeding Disorders: various disorders of the blood clotting mechanisms can cause or exacerbate rectal bleeding:

Other Causes: Some other causes of rectal bleeding include:

Similar Symptoms: See also the causes of related symptoms such as:

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Note: This site is for informational purposes only and is not medical advice. See your doctor or other qualified medical professional for all your medical needs.