Bloody diarrhea

What it means

Passage of many stools containing blood.

Diarrhea that contains bright red or maroon-colored blood may be referred to as hematochezia, while melena is used to describe black, tarry, and smelly diarrhea.

Rare diseases that can present with this18

The range is how often this sign appears among people diagnosed with each disease — it is not a probability of having any of them. Many of these signs also occur in common, non-rare conditions. A sign on this page is a conversation to have with a clinician, not a conclusion.

Part of the broader category

Also called: Blood in stool · Bloody stool