People who have emphysema have a hard time exhaling. As a result, they develop a physical characteristic called

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Emphysema, a type of chronic obstructive pulmonary disease (COPD), causes the air sacs in the lungs to become damaged, leading to difficulty in exhaling air. This results in the need for the lungs to take in more air to ensure adequate oxygenation, which can cause the chest to expand and take on a rounded, "barrel" shape, hence the term "barrel chest."

People Who Have Emphysema Have a Hard Time Exhaling