The root cause of yin deficiency is not in yang deficiency, the root cause of yin deficiency is mostly due to the heat disease, or the disease is long depleted yin fluid, or over-served warm and dry food, etc. Yin deficiency of different organs has different etiology and symptomatic manifestations. Yin deficiency can be seen in various organs, such as lung yin deficiency, mostly due to prolonged coughing and injury to the yin, or late fever yin and fluid loss, symptoms of dry mouth, dry cough, phlegm, dry pharynx, hoarseness, etc.; heart yin deficiency is mainly due to prolonged illnesses that deplete the yin and blood, or blood loss, symptoms of heartburn, palpitations (heartbeat accelerated, often accompanied by panic), insomnia, dreaming and so on. Stomach yin deficiency due to gastric disease, or usually like to eat spicy food and so on, symptoms see the stomach and epigastric hidden burning pain, like hunger and do not want to eat, thinness and fatigue, thirst, thirst, dry mouth and throat, etc.; Kidney yin deficiency by the body of the yin deficiency, or long-term disease injury to the kidneys, or overdoing it, such as resulting in symptoms such as lumbar and knee pain, dizziness and tinnitus, hot flashes (bursts of fever), night sweats (abnormal sweating after going to bed and waking up sweating to stop), and so on. If you experience any discomfort, it is recommended that you go to the hospital for treatment after being diagnosed by a professional Chinese medicine practitioner, so as to avoid prolonged deficiency of yin and damage to yang qi, leading to deficiency of both yin and yang.