Is dry cough due to lung yin deficiency or lung yang deficiency?

In general, according to traditional Chinese medicine (TCM) theory, dry cough may be caused by either lung yang deficiency or lung yin deficiency. The specific cause must be determined based on the patient's overall symptoms. If dry cough persists, timely medical consultation is recommended. The detailed analysis is as follows:

1. Lung Yang Deficiency

If dry cough is due to lung yang deficiency, it is typically accompanied by weak coughing, a low and feeble voice, and in severe cases, an inability to produce a voice when coughing. This may also be associated with general fatigue, aversion to cold, and cold limbs. The presence of these symptoms usually indicates lung yang deficiency.

2. Lung Yin Deficiency

If dry cough results from lung yin deficiency, it commonly manifests as dry mouth and throat, a dry and harsh cough, minimal phlegm or sticky phlegm that is difficult to expel, and may even include symptoms such as sore throat and hoarseness. This occurs because lung yin deficiency leads to insufficient moistening of the lungs, impairing normal lubrication of the respiratory tract and thereby triggering dry cough.

Regardless of whether dry cough is caused by lung yang deficiency or lung yin deficiency, treatment should be conducted under the guidance of a physician. In daily life, patients should pay attention to drinking sufficient water, which can help alleviate symptoms of dry cough.