Dry cough without phlegm throat itching tongue coating white and thin mostly caused by dry evil injury to the lungs, the specific causes need to be identified according to the condition, need to go to the hospital in time. Dry evil attack, from the mouth and nose into the lungs for the Huagai delicate organs, easy to be injured by the evil, and the lungs open the orifices in the nose, more susceptible to damage. Dry evil injury to the lungs, fluid damage, which will appear in the throat itchy performance. Lung qi is not propagated, which is manifested as cough. Dryness is dry, so the patient coughs, but there is no sputum, only a dry cough without sputum, if the dryness of the evil injury to the complex, it may also be manifested in the sputum with blood. Dryness is superficial (on the surface of the muscle) and there is no obvious heat, so the tongue coating is white and thin. The patient should go to the hospital in time, and under the doctor’s guidance, use drugs to clear dryness and moisten the lungs, nourish yin and promote the production of fluids for treatment, such as clearing dryness and rescuing the lungs soup. Do not use medicine without authorization to ensure their own safety.