Nine out of ten coughs are not scientific, not true. Cough is mainly due to the feeling of wind, cold, summer, dampness and other external evils or internal injuries caused by the loss of lung qi declared, so that the lung qi caused by upward reversal. Its lesions are mainly in the lungs, but also involves the liver, kidney, spleen and other organs. Coughs are mainly categorized into external coughs and internal coughs. Exogenous cough is caused by wind-cold, wind-heat and wind-dryness; internally injured cough is caused by phlegm-dampness, phlegm-heat, liver-fire and lung-yin deficiency (insufficient yin-liquid in the lungs). Therefore, cough caused by lung deficiency is only one kind of internal injury cough. The causes of cough are many and complex, not mostly due to lung deficiency. Therefore, it is not true that nine out of ten coughs are caused by lung deficiency. Cough is recommended to actively go to the hospital for consultation and treatment, do not arbitrarily take medication, so as not to cause adverse consequences.