Two years after colostomy, have had several times when bright red blood has come from rectum, but goes away almost immediately. ?

Question for your dr: That is a question you should ask your gastroenterologist or surgeon. I see you are on a blood thinner. That makes the bright red blood more worrisome. You don't say why you have the colostomy. That would be helpful to know, as well. I wish you the very best.

Colon/rectal: Cetainly have stool and rectum checked for bleeding. Anoscopy will explore the rectal/anal area. Avoid heavy red meat ingestion.