Pneumonia is an infection that inflames the air sacs in one or both lungs. The air sacs may fill with fluid or pus (purulent material), causing cough with phlegm or pus, fever, chills, and difficulty breathing. A variety of organisms, including bacteria, viruses and fungi, can cause pneumonia . Learn about the different types of pneumonia , how they are caused by bacteria, viruses, or fungi, and how they affect the lungs. Find out how to prevent, diagnose, and treat pneumonia with antibiotics, antivirals, or antifungals. Pneumonia is an infection of the lungs caused by fungi, bacteria, or viruses. General symptoms include chest pain, fever, cough, and trouble breathing. Pneumonia is the infection and inflammation of air sacs in your lungs. These air sacs, called alveoli, can fill with fluid or pus, causing a serious cough and fever.
