Spitting stomach acid may be caused by physiological factors such as improper diet, or it may be related to pathological factors such as peptic ulcer, chronic gastritis and gastroesophageal reflux disease. 1. Physiological factors: if the patient eats too much spicy food such as chili peppers or greasy food that is difficult to digest, or overeating, alcoholism, or when the abdomen is cold, it may stimulate the gastric mucosa, leading to an increase in the secretion of gastric acid, and the symptom of vomiting stomach acid occurs. In addition, women of childbearing age should also pay attention to whether it is caused by pregnancy. 2. Pathological factors: chronic gastritis, peptic ulcer, Zuo Ai syndrome and other diseases are usually accompanied by increased secretion of gastric acid, leading to the symptoms of spitting. Typical symptoms of GERD patients are acid reflux and heartburn, which can also manifest as spitting stomach acid. If the patient has long-term or recurrent symptoms of acid reflux, it is recommended to consult a doctor in time to identify the cause of the disease under the guidance of a professional physician and carry out targeted treatment to avoid delaying the condition.