Stomach acid can be experienced as vomiting, acid reflux, heartburn, heartburn, and pain. Stomach acid is a kind of digestive fluid secreted on the cells of the stomach wall, and its main function is to assist the food and help the digestion of proteins, sugars and fats, but some people will be due to diseases or bad moods, thus leading to excessive secretion of stomach acid. Excessive stomach acid causes some irritation to the mucous membrane of the stomach wall, and many patients will be accompanied by the performance of spitting acid water. When hyperacidity is accompanied by gastroesophageal reflux disease (GERD), it is also accompanied by the symptom of acid reflux. When gastric acid damages the gastric mucosa and esophageal mucosa, the patient will experience heartburn, burning and pain in the sternal area. Prolonged acidity also induces gastritis and gastric ulcers, especially when ulcers occur in the gastric mucosa, accompanied by severe pain.