Chronic Obstructive Pulmonary Disease
COPD is a lung disease that makes it harder to breathe, and is caused by damage to the lung over years usually from smoking.
COPD usually comes from these two diseases:
Emphysema is wherethe air sacs are damages and lose their streach and less air gets in and out of the lungs.
Chronic Bronchitis where the airways that carry air to the lungs becomes inflammed and causes lots of mucus