Cough how to distinguish between lung cold or lung heat, according to the nature of the cough and sputum difference, according to the accompanying symptoms difference. 1. The difference in the nature of the cough: lung cold cough heavy voice, shortness of breath; lung heat cough frequent and violent, thick air or cough hoarse. Lung cold cough sputum thin color white; lung heat cough sputum unpleasant, sputum sticky or yellow. 2. Accompanying symptoms: Lung cold cough accompanied by itchy throat, runny nose, chills (fear of cold), pale color (white and lusterless), no sweat. Lung-heat cough is accompanied by dryness and pain in the throat, runny nose, red face and thirst. Lung cold and lung heat cough should be diagnosed and treated by a professional doctor, do not identify and use medication on your own to avoid misunderstanding or aggravation of the condition.