Lung qi distension and fullness. It generally refers to conditions characterized by wheezing, coughing, and chest fullness, caused by the failure of the lung to descend and purify. It can be classified into deficiency and excess patterns. The excess pattern is often due to pathogenic qi obstructing the lung, leading to the failure of lung qi to descend; the deficiency pattern is usually caused by deficiency of both the lung and kidney, resulting in the kidney's inability to receive qi and the counterflow ascent of lung qi. It can be seen in conditions such as pneumonia, acute bronchitis, bronchial asthma, and lung qi swelling with infection.