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Cancer Health Center

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Stomach (Gastric) Cancer Prevention (PDQ®): Prevention - Patient Information [NCI] - Stomach Cancer Prevention

Avoiding risk factors and increasing protective factors may help prevent stomach cancer.

Avoiding cancer risk factors may help prevent certain cancers. Risk factors include smoking, being overweight, and not getting enough exercise. Increasing protective factors such as quitting smoking, eating a healthy diet, and exercising may also help prevent some cancers. Talk to your doctor or other health care professional about how you might lower your risk of cancer.

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The following are risk factors for stomach cancer:

Certain medical conditions

Having any of the following medical conditions may increase the risk of stomach cancer:

Certain genetic conditions

Genetic conditions may increase the risk of stomach cancer in people with any of the following:


The risk of stomach cancer may be increased in people who:

  • Eat a diet low in fruits and vegetables.
  • Eat a diet high in salted or smoked foods.
  • Eat foods that have not been prepared or stored the way they should be.

Environmental causes

Environmental factors that may increase the risk of stomach cancer include:

  • Being exposed to radiation.
  • Working in the rubber or coal industry.

The risk of stomach cancer is increased in people who come from countries where stomach cancer is common.

The following are protective factors that may decrease the risk of stomach cancer:

Stopping smoking

Studies show that smoking is linked with an increased risk of stomach cancer. Stopping smoking or never smoking decreases the risk of stomach cancer. Smokers who stop smoking lower their risk of having stomach cancer over time.

Treating Helicobacter pylori infection

Studies show that chronic infection with Helicobacter pylori (H. pylori) bacteria is linked to an increased risk of stomach cancer. When H. pylori bacteria infects the stomach, the stomach may become inflamed and cause changes in the cells that line the stomach. Over time, these cells become abnormal and may become cancer.

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