Since chronic obstructive pulmonary disease (COPD) is a group of chronic lung diseases that make it more difficult to breathe, people with COPD often have at least one lung disease, such as emphysema.

Surgical emphysema is another term for subcutaneous emphysema. It occurs when air or gas enters the subcutaneous tissue, which is the deepest layer of the skin. People can develop surgical emphysema ...

Emphysema is a lung condition often caused by smoking, leading to damage of the air sacs, which can make it difficult to breathe. The stages of emphysema are determined by symptoms and breathing tests ...