Emphysema is a long-term, progressive disease of the lung that primarily causes shortness of breath. In people with emphysema, the tissues necessary to support the physical shape and function of the lungs are destroyed. It is included in a group of diseases called chronic obstructive pulmonary disease or COPD (pulmonary refers to the lungs). Emphysema is called an obstructive lung disease because the destruction of lung tissue around smaller airways, called alveoli, makes these airways unable to hold their functional shape upon exhalation.Read more on Wikipedia
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