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What Is COPD?

COPD stands for chronic obstructive pulmonary disease. It means the airways in your lungs are blocked (obstructed). This makes it hard to breathe. You may have trouble with daily activities because of shortness of breath. Over time the shortness of breath often gets worse. This makes it harder to take care of yourself and take part in activities. Chronic bronchitis and emphysema are 2 common types of COPD.

How did I get COPD?

Most people get COPD from smoking. Cigarette smoke damages lungs. This can develop into COPD over many years.

How COPD affects you

COPD makes you work harder to breathe. Air may get trapped in the lungs. This prevents your lungs from filling completely with fresh oxygen-filled air when you breathe in (inhale). It's harder to take deep breaths, especially when you are active and start breathing faster. Over time your lungs may become enlarged, filled with air that does not transfer oxygen into the blood. These problems lead to shortness of breath (also called dyspnea). Hoarse, whistling breathing (wheezing) and a chronic cough are common. So is feeling tired and worn out (fatigue). 

What happens in chronic bronchitis?

Cross section of bronchiole showing airway mostly blocked by mucus, inflammation, and muscle constriction.

The cells in the airways make more mucus than normal. The mucus builds up, narrowing the airways. This means less air travels into and out of the lungs. The lining of the airways may also become swollen (inflamed). This causes the airways to narrow even more.

What happens in emphysema?

Collapsed bronchiole and alveolar sacs with emphysema.

The small airways are damaged and lose their stretchiness. The airways collapse when you exhale. This causes air to get trapped in the air sacs. This means that less oxygen enters the blood vessels. And less oxygen is delivered to all of the cells of your body. This makes it hard to breathe.

Damage to cilia

Cells with damaged cilia showing mucus buildup and particles in mucus.

Cilia are small hairs that line and protect the airways. Smoking damages the cilia. Damaged cilia can’t sweep mucus and particles away. Some of the cilia are destroyed. This damage makes COPD worse.

Online Medical Reviewer: Alan J Blaivas DO
Online Medical Reviewer: Daphne Pierce-Smith RN MSN CCRC
Online Medical Reviewer: Wanda Taylor RN PhD
Date Last Reviewed: 8/1/2018
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