Studies have found the following risk factors for stomach cancer:

• Age: Most people with this disease are 72 or older.
• Sex: Men are more likely than women to develop stomach cancer.
• Race: Stomach cancer is more common in Asian, Pacific Islander, Hispanic, and African Americans than in non-Hispanic white Americans.
• Diet: Studies suggest that people who eat a diet high in foods that are smoked, salted, or pickled may be at increased risk for stomach cancer. On the other hand, eating fresh fruits and vegetables may protect against this disease.
• Helicobacter pylori infection: H. pylori is a type of bacteria that commonly lives in the stomach. H. pylori infection increases the risk of stomach inflammation and stomach ulcers. It also increases the risk of stomach cancer, but only a small number of infected people develop stomach cancer.

  Although infection increases the risk, cancer is not contagious. You cannot catch stomach cancer from another person who has it.

• Smoking: People who smoke are more likely to develop stomach cancer than people who do not smoke.
• Certain health problems: Conditions that cause inflammation or other problems in the stomach may increase the risk of stomach cancer:
  • Stomach surgery
  • Chronic gastritis (long-term inflammation of the stomach lining)
  • Pernicious anemia (a blood disease that affects the stomach)
• Family history: A rare type of stomach cancer runs in some families.