Stomach cancer is a disease in which cancer cells grow in the stomach. There are five layers of tissue in the stomach. Types of cancer include:

  • Adenocarcinoma—tumors of the mucosa (the innermost layer), which make up over 90% of stomach cancers
  • Lymphoma—a cancer of the immune system, which is sometimes found in the stomach wall
  • Gastric stomal tumors—tumors of the stomach wall
  • Carcinoid tumors—tumors of the hormone-producing cells of the stomach

Stomach Cancer
Stomach cancer
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Cancer occurs when cells in the body divide without control or order. Eventually these uncontrolled cells form a growth or tumor. The term cancer refers to malignant growths. These growths can invade nearby tissues including the lymph nodes. Cancer that has invaded the lymph nodes can then spread to other parts of the body.

It is not clear exactly what causes these problems in the cells, but is probably a combination of genetics and environment.