<unk>  is a long-term, progressive disease of the lungs that primarily causes shortness of breath. In people with<unk> , 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).<unk>  is called an obstructive lung disease because the destruction of lung tissue around smaller sacs, called alveoli, makes these air sacs unable to hold their functional shape upon exhalation.<unk>  is most often caused by tobacco smoking and long-term exposure to air pollution.
The term<unk>  means "swelling" and derives from the Greek ἐμφυσᾶν<unk> hysan meaning "inflate" - itself composed of ἐν en, meaning "in", and φυσᾶν physan, meaning "breath, blast".
Emphysema
Pleurisy
Chronic bronchitis
Atelectasis
Empyema
Trapped lung
Bronchiectasis
Acute bronchitis