Lung distention is a chronic condition of the Lungs characterized by symptoms such as chronic breathlessness, wheezing, and cough. It is caused by a deficiency of the Lungs and Kidneys, as well as the presence of phlegm and thin mucus in the Lungs. The weakness of the Lungs and Kidneys leads to a build-up of inspired qi in the chest, causing it to inflate. This, combined with weakness of the Lungs and Spleen, leads to the accumulation of phlegm, while weakness of the Lungs and Heart leads to the accumulation of fluids and poor circulation to the periphery, resulting in blood stasis. This combination of profound organ system weakness and phlegm obstruction makes it difficult for individuals with lung distention to acquire da qi, leading to a progressive decline in their overall health. While lung distention may resemble other Chinese medical conditions such as wheezing, dyspnea, and cough, it is distinguished by its chronic and progressive nature and the difficulty in responding to treatment.