What is angiodysplasia?
A person with angiodysplasia has enlarged and fragile blood vessels beneath the lining of the large intestine. These fragile vessels tend to bleed easily, but dangerous bleeding is rare. Angiodysplasia is a common cause of rectal bleeding and bloody stool in the elderly.

What are the symptoms of angiodysplasia?
Common symptoms of angiodysplasia include rectal bleeding, bloody stools, and black stools.

How does the doctor treat angiodysplasia?
Treatment for angiodysplasia may include laser cautery that is performed during colonoscopy. Other options include injecting a medication that forms a blood clot in the bleeding vessel.