2 types: Maybe more but one is chronic obstructive that you see in emphysema (COPD) and another type is rare but is where a physical obstruction such as a tumor is blocking the airway. Most chronic obstr is due to genetic or smoking related or other environmental factors that break down good lung tissue and replace it with scar tissue.
Answered 12/26/2014
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7 doctors weighed in across 2 answers
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