"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." In addition to being able to describe your stool to a doctor, it's helpful to have a general idea of the ...

Your poop reveals key clues about your health — here are a few red flags to keep an eye on.

Add Yahoo as a preferred source to see more of our stories on Google. Your small intestine is lined with tiny protrusions called villi that play a big role in digestion. Sebastian Kaulitzki/Science ...