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 ...

A stool test is a diagnostic procedure that involves analyzing fecal matter, or poop, to check for signs of infection, inflammation, or disease. The specific analysis depends on a person’s symptoms ...

Much of the food you eat is absorbed by your digestive system, which includes your stomach and your intestines. But some of what you eat makes it all the way through those twists and turns and comes ...