Wheezing is a condition in which a person has difficulty breathing, with a high-pitched sound heard during breathing. In Chinese medicine, this is thought to be caused by the accumulation of qi in the chest, due to problems with the natural descent or diffusion of lung qi. This can be caused by excess or deficient pathology, such as obstruction or constriction of lung qi by pathogens, or weakness in the spleen or kidneys. Wheezing can be acute or chronic, and in severe cases, can be life-threatening. It is important to differentiate wheezing from dyspnea, as the two conditions have different prognoses and treatment approaches.