The continuous ingestion of high concentrations of salt irritates the stomach lining, and this has been proposed as a potential cause of gastric cancer. 

When people

eat variety of foods that are preserved by drying, smoking, salting, or pickling they are at a higher risk of developing stomach cancer. 

Low Fruits and Vegetables in the diet, and high fat content can lead to stomach cancer. 

Chemical carcinogens like rubber by-products, coal tar and asbestos have increased cancers in industrial workers. 

Long standing ulcers, with the common bacteria 'Helicobacter Pylori ' may become malignant over time.