Chronic Obstructive Asthma

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Chronic obstructive pulmonary disease (COPD), also called chronic obstructive lung disease, is a term that is used for two closely related diseases of the respiratory system: chronic bronchitis and emphysema.

In many cases these diseases occur together, although there may be more symptoms of one than the other.

Most patients with these diseases have a long history of heavy cigarette smoking.

COPD gets gradually worse over time. At first, there may be only a mild shortness of breath and occasional...

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