ON THIS PAGE: You will find some basic information about this disease and the parts of the body it may affect. This is the first page of Cancer.Net’s Guide to Stomach Cancer. To see other pages, use the menu. Think of that menu as a roadmap to this full guide.
About the stomach
The stomach is located in the upper abdomen and plays a central role in digesting food. When food is swallowed, it is pushed down the muscular tube called the esophagus, which connects the throat with the stomach. Then, the food enters the stomach. The stomach mixes the food and releases gastric juices that help break down and digest the food. The food then moves into the small intestine for further digestion.
Types of stomach cancer
Stomach cancer, also called gastric cancer, begins when healthy cells in the stomach become abnormal and grow out of control. A tumor can be cancerous or benign. A cancerous tumor is malignant, meaning it can grow and spread to other parts of the body. A benign tumor means the tumor can grow but will not spread. Cancer can begin in any part of the stomach, and it can spread to nearby lymph nodes and other areas of the body, such as the liver, bones, lungs, and a woman’s ovaries.
Most stomach cancers are a type called adenocarcinoma, which means that the cancer started in the glandular tissue that lines the inside of the stomach. Other types of cancerous tumors that form in the stomach include lymphoma , gastric sarcoma , and carcinoid tumors , but these are rare.
Looking for More of an Introduction?
If you would like more of an introduction, explore these related items. Please note these links will take you to other sections on Cancer.Net:
ASCO Answers Fact Sheet: Read a 1-page fact sheet  that offers an introduction to this type of cancer. This fact sheet is available as a PDF, so it is easy to print.
The next section in this guide is Statistics . It helps explain how many people are diagnosed with this disease and general survival rates. Or, use the menu to choose another section to continue reading this guide.