Gastric acid is hydrochloric acid continuously secreted by the cells of the stomach gland wall, which not only activates other substances in the gastric juice to provide a suitable environment for pepsin, but also kills the bacteria that enter the stomach together with food, and promotes the absorption and digestion of protein. The causes of gastric acid are as follows: 1, improper diet: the amount of gastric acid secretion is related to the type and amount of food eaten, if you eat too much, it will promote the secretion of gastric acid from the sinus; eating stimulating food and too sweet food will stimulate the stomach wall cells, such as chili peppers, onions, chocolate, etc., will increase the secretion of gastric acid, so we should develop good eating habits, eat regularly and in the right amount, avoid the intake of stimulating and too sweet food, pay attention to keep warm. 2, stomach and duodenal disease: when suffering from gastric ulcer or duodenal ulcer is easy to appear acid reflux, nausea and other uncomfortable symptoms, the study considered related to infection with Helicobacter pylori, Helicobacter pylori causes damage to the gastric mucosa, inflammation, ulcers and other lesions, gastrointestinal function changes, resulting in excessive secretion of gastric acid. 3, mental factors: mental condition will have a significant impact on the function of the digestive system, especially highly stressed and stressed people, long-term tension, such as coupled with irregular diet or suffering from other diseases, it will cause cortical dysfunction, which in turn affects the secretion of gastric juice. As mentioned above, there are many causes of stomach acidity, and it is important to provide the correct treatment for the specific cause and to maintain good eating habits.