Chronic obstructive pulmonary disease or COPD is a common lung illness that makes it very difficult to breathe. Two of the main types of COPD are chronic bronchitis and emphysema. The symptoms of …
Chronic obstructive pulmonary disease or COPD is a common lung illness that makes it very difficult to breathe. Two of the main types of COPD are chronic bronchitis and emphysema. The symptoms of …