The gastrointestinal (GI) tract includes all the parts of our digestive system and its associated organs, including the esophagus, pancreas, stomach, colon, rectum, anus, liver, biliary system, and small intestine. Hence, GI cancers include abnormal cell growth over any of these parts.
Typically, the cells of these organs continually get damaged or die and are replaced with healthy cells. However, if these dead cells continue to multiply limitlessly, they create clusters of lumpy tumors over the affected organ. When not diagnosed in time, these tumors metastasize, i.e., spread across the adjacent organs, affecting the entire digestive system.