What is stomach cancer?

Stomach cancer, also known as gastric cancer, is cancer that starts in any part of the stomach. The stomach is just one of many organs located in the abdomen, the area of the body between the chest and the pelvis. Among other organs found in the abdomen are the liver, pancreas, gallbladder and colon. It is important to differentiate among these organs, because cancers and other diseases that affect them present different symptoms and are treated differently.