[Risk factors of stomach cancer].

The risk factors for stomach cancer are reviewed. A family history of stomach cancer, smoking habit, highly salted foods and Helicobacter pylori are risk factors, while fresh vegetables, fruits and green vegetables are preventive ones. Stomach cancer may arise mainly from moderately but not severely atrophic gastric mucosa, where atrophic change is ongoing. New strategies for primary and secondary prevention of stomach cancer should be built utilizing these recent findings.