Chronic gastritis is caused by the following factors: ① eating too fast, inadequate chewing of food (such as when there is dental disease); ingestion of too coarse, too cold or too hot food. ②H. pylori infection. Most often seen after acute gastritis, gastric mucosal lesions that do not heal over time or commit repeated episodes, gradually evolving into chronic superficial gastritis. ③Smoking. The main harmful component of tobacco is nipagin, long-term smoking can make the pyloric sphincter relaxation, duodenal fluid reflux, gastric vasoconstriction, increased gastric acid secretion, thereby destroying the gastric mucosal barrier. Resulting in chronic inflammatory lesions of the gastric mucosa. ④Irritant drugs. Certain drugs such as salicylic acid preparations, corticosteroids, digitalis, indomethacin (anti-inflammatory pain), and pau d’arco can cause chronic gastric mucosal damage. ⑤ Stimulating food. Long-term references to spirits, strong tea, coffee, consumption of spicy and rough food, too hungry or too full and other irregular diet can destroy the protective barrier of the gastric mucosa and gastritis. (6) Mental factors. Due to mental unhealthiness, long-term mental tension, worry or sullen state, can cause the whole body sympathetic nucleus parasympathetic nerve function imbalance. Especially the sympathetic nerve is in a state of excitement for a long time, will lead to gastric mucosal vasodilator function flocculation, so that the gastric mucosal blood flow reduction, destruction of the gastric mucosal barrier over time will form the gastric mucosa chronic inflammatory response.