(A) dietary factors: The study showed that hot-eat food, drink liquor can cause gastric mucosal injury, and the incidence of gastric cancer as incentives.

     (2) living habits: high salt food can increase the gastric mucosa damage, often eat salted foods high concentration of people and is closely related to the incidence of gastric cancer.

     (3) nitrosamine compounds: scholars at home and abroad to carcinogenic nitrosamines more attention nitrosamines present in some foods, such as smoked fish, meat, sausages and other food products, is not only a cause of gastritis, gastric cancer is caused subsequent factors.

     (4) genetic factors: a survey found that gastric cancer with type A blood links. Gastric cancer is also found in the common close relatives, this once again shows that genetic factors play an important role.

     (5) environmental factors: multiple gastric cancer in the highland temperate climate, such as arid and semi-arid area in the upper reaches of the Yellow River, Gansu Corridor. In the warm tropical and subtropical, tropical, sub-humid areas with little incidence of gastric cancer, such as the Yangtze River and the lower reaches of the Minjiang River mouth.

     (6) other stomach diseases and the relationship between gastric cancer: some diseases are more opportunities in gastric cancer, is currently subject to the gastric precancerous lesions of the following diseases: chronic atrophic gastritis 1: The disease has long been considered a precancerous disease, the large crowd that the findings Atrophic gastritis and gastric cancer is a very close relationship. ② gastric polyps: be considered precancerous gastric cancer diseases, in particular lesion diameter of more than 2cm polyps in its evolution rate of gastric cancer. ③ ulcer: perishable unhealed ulcer should be carefully examined to rule out malignant ulcers. Cancer occurred mainly in the surrounding gastric ulcer inflammation on the basis of epithelial regeneration.

     (7) the bad habits: smoking, such as.

    (8) the spirit of factors: long-term depression, such as.