Researchers say they have discovered an entirely new class of life inside the human body, and it is very similar to a virus.

The digestive system is the series of tubelike organs that convert our meals into body fuel. There are about 30 feet (9 meters) of these convoluted pipeworks, starting with the mouth and ending ...

Your digestive system helps turn the food and drinks you consume into the nutrients you need. Sometimes there can be something off with your digestive system, leading to symptoms like nausea ...