Gastrointestinal cancer (GI Cancer) is a term for the group of cancers that can affect any or all regions of the intestinal system. This can include cancer in various regions of the esophagus, gallbladder, liver, stomach, pancreas, small intestine, bowels (large intestine, colon, rectum), and the anus. Symptoms of GI cancer is usually noticeable and severe, leading to an immediate need to seek diagnosis and treatment. If you feel a variety of symptoms (poor appetite, weight loss, pain, nausea, or vomiting with blood) it is important to seek proper medical care.