Related to the digestive system. The upper GI tract includes the esophagus, stomach, and small intestine. The lower gastrointestinal tract includes the large intestine. Bleeding from the gastrointestinal tract is a common cause of iron deficiency anemia.
GI) Tract - The large, muscular tube that extends from the mouth to the anus, where the movement of muscles and release of hormones and enzymes digest food. Also called the alimentary canal or digestive tract.