The tongue coating of Lung Yin deficiency is mainly characterized by red tongue texture, little and dry tongue coating. Lung yin deficiency is often caused by wind, fire, dryness and other evils attacking the lung guards, the lung qi can not be declared, and the disease is not cured for a long time, which involves the lung yin and then causes lung yin deficiency. Yin deficiency is hot, so the tongue is reddish, and the tongue coating is less and dry; if the heat is deep, the tongue is red, and the tongue is prickly; if the heat is deeper, the tongue coating will be prickly and bright red; if there is a bit of prickly on the tongue, and the color is reddish purple, it is the heat evil that goes deep into the camping blood. Patients with lung yin deficiency are also often accompanied by symptoms such as five heart-heat (heat in the hearts of the hands and feet, and self-consciousness of the heart and chest), afternoon hot flashes (a burst of heat), night sweating (abnormal sweating after going to sleep, and sweating stops after waking up), etc. They can be treated with yin-nourishing formulas, such as Sasanqua and Ophiopogon Soup, to nourish the lungs and moisten the lungs (replenish the body’s yin fluids to moisturize the lungs), and to resolve phlegm and stop coughing. If patients have symptoms related to lung yin deficiency, they should go to the Chinese medicine department of the hospital in time and follow the doctor’s instructions to take the medication, do not self-medicate.