Dry cough is a symptom of coughing with no sputum or less sputum, which is sticky and difficult to cough up. It is one of the common symptoms of respiratory diseases. It is often seen in common cold, pharyngitis, laryngitis, acute attack of chronic bronchitis, bronchial asthma, etc. From the perspective of traditional Chinese medicine, dry cough is mainly caused by exogenous evils, mainly dryness, which attacks the lungs and impedes the diffusion of lung qi, or chronic disease that damages lung yin, lung qi stagnation, and body fluid, so the phlegm is less viscous, causing dry cough.
