What causes pulmonary bullae emphysema?

Emphysema is a more common disease, causing emphysema is a relatively many reasons, such as long-term smoking, external dust stimulation, air pollution, respiratory tract infection and long-term inhalation of harmful gases, will cause emphysema performance. Emphysema clinical manifestations are trance, decreased appetite, physical fatigue, respiratory disorders, easy to cause fever and limbs show edema and other performance. During emphysema, the residual volume of the lungs is much higher than normal, resulting in lung swelling. Emphysema cannot be completely treated. only with medication and diet can emphysema be slowed down. The main patients are long-term smoking and long-term work environment.