Pneumonia is a common lung infection that inflames the air sacs in one or both lungs. These sacs may fill with mucus, causing difficulty breathing. Many bacteria, viruses, and fungi can cause pneumonia. Symptoms change depending on the source of the infection and the person's overall health. Common symptoms involve fever, feeling cold, fatigue, tr

Pneumonia is a/happens to be/presents as an infection that inflames the read more air sacs in one or both lungs. These air sacs may fill with fluid or pus (purulent material), causing cough with phlegm or pus, fever, chills, difficulty breathing, and aches in your chest. Pneumonia can be caused by a variety of organisms, including bacteria, viruses