Cough

A Lung-related symptom characterized by cough sound, sputum features, throat sensation, and breathing quality.

Acute cough often reflects exterior invasion, while chronic cough suggests internal causes such as Lung yin deficiency, Lung qi deficiency, or phlegm.

Chronic dry cough with scant sputum and dry throat leans toward yin deficiency; easy catching colds with weak voice leans toward qi deficiency; abundant sputum and oppression point toward phlegm.