Helicobacter pylori (H. pylori) infection of the stomach.
Chronic gastritis (inflammation of the stomach).
Pernicious anemia.
Intestinal metaplasia (a condition in which the normal stomach lining is replaced with the cells that line the intestines).
Familial adenomatous polyposis (FAP) or gastric polyps.
Eating a diet high in salted, smoked foods and low in fruits and vegetables.
Eating foods that have not been prepared or stored properly.
Being older or male.
Smoking cigarettes.
Having a mother, father, sister, or brother who has had stomach cancer.