Chronic Obstructive Pulmonary Disease (COPD) causes
Chronic Obstructive Pulmonary Disease (COPD)
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Smoking is the leading cause of emphysema, a disease of the lungs that makes it hard to breathe. Learn more about how emphysema affects you and how it's treated.
Learn about the causes and symptoms of chronic bronchitis, how to get tested, and when to seek treatment.
Alpha-1 antitrypsin is a protein in blood that the liver and lungs use to control the immune response. An alpha-1 antitrypsin deficiency (AAD) means there is too little of the functioning protein in your blood. When bacteria or other harmful subst...