Pneumonia is a common pulmonary infection that inflames the alveoli in one or both lungs. These areas may fill with fluid, causing difficulty breathing. Numerous bacteria, viruses, and fungi can cause pneumonia. Symptoms change depending on the source of the infection and the person's overall health. Common symptoms include fever, chills, fatigue,

Pneumonia is a/happens to be/presents as an infection that inflames the 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, shortness of breath, and aches in your chest. Pneumonia can be caused by a variety of organisms, including bacteria, viruses, and fungi