Stomach yin deficiency is usually caused by excessive consumption of spicy, warm and dry food that burns the stomach yin, or vomiting and diarrhea in the late stage of warm-heat disease that depletes the stomach fluid. Excessive consumption of spicy, warm and dry food will aggravate the heat and poisonous fire, thus damaging the fluid in the stomach and causing gastric yin deficiency. Excessive vomiting and diarrhea in the late stage of warm-heat disease will deplete the fluid and damage the stomach yin, resulting in deficiency of stomach yin. Due to the deficiency of stomach yin, the stomach is out of harmony (the stomach’s function of descending and passing is impaired), and internal heat is generated, then clinically the patient mostly shows vague pain in the stomach and epigastric region, epigastric rumpus, dry mouth and throat, hunger, no appetite for food, noisy (stomach has a feeling similar to hunger, emptiness, with burning sensation), vomiting, urinating short and red (urine is small in volume and dark yellow in color), and stool dryness and knotting, etc. If the patient has these symptoms, it is necessary to vomit and diarrhea as soon as possible. If patients experience the above symptoms, they should go to the hospital as soon as possible to have the cause clarified and then be given targeted treatment by a professional Chinese medicine practitioner.