What Causes Pneumonia and Who Is at Risk? Pneumonia symptoms can vary widely from a mild flu to a life-threatening emergency. Cough, fever, and fatigue are common, but you should seek help for more ...

Muscle wasting, which develops in later-stage emphysema, can make a barrel chest more obvious. Cyanosis is a lack of sufficient oxygen in the tissues. It's characterized by a change in color of the ...