Emphysema is a chronic (long-term) lung disease, usually caused by smoking. Emphysema is the main form of chronic obstructive pulmonary disease (COPD).
Diagnosing emphysema usually requires pulmonary function tests, combined with a history of symptoms, such as shortness of breath. There is no emphysema cure other than lung transplantation. However, emphysema treatments can improve symptoms and preserve lung function.