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. Pneumonia is a lung infection that causes the air sacs in one or both lungs to become inflamed. Cough with phlegm or pus, fever, chills, and trouble breathing can occur when the air sacs fill with fluid or pus (purulent material). Pneumonia is acute inflammation of the lungs caused by infection. Initial diagnosis is usually based on chest x-ray and clinical findings. Causes, symptoms, treatment, preventive measures, and prognosis differ depending on whether the infection is bacterial, mycobacterial, viral, fungal, or parasitic; whether it is acquired in the community or hospital; whether it occurs in a patient treated with mechanical ventilation; and whether it develops in a patient who is immunocompetent or ... PNEUMONIA definition : 1. a serious illness in which one or both lungs become red and swollen and filled with liquid: 2…. Learn more.
