Chronic gastritis may be caused by improper diet, Helicobacter pylori infection, drug stimulation and other reasons. 1. Improper diet: If patients consume spicy and stimulating foods, irregular meals, overeating, etc. for a long period of time, it may damage the gastric mucosa and cause chronic gastritis. 2. Helicobacter pylori infection: Helicobacter pylori is generally transmitted through the fecal-oral route. Once infected with Helicobacter pylori, the metabolites it produces can neutralize the gastric acid in the mucus, causing the bacterium to colonize and cause damage to the gastric mucosa, thus developing into chronic gastritis. 3. Drug stimulation: patients who take non-steroidal anti-inflammatory drugs for a long time, will make the gastric mucous membrane barrier is damaged, thus inducing chronic gastritis, and in severe cases, can induce ulcers. Chronic gastritis may also be caused by other factors such as bile reflux, it is recommended that the patient discomfort, go to the hospital in a timely manner, to clarify the cause of the disease under the guidance of the doctor reasonable treatment.