what is pneumonia symptums
Pneumonia is an inflammatory condition of the lung affecting primarily the microscopic air sacs known as alveoli. It is usually caused by infection with viruses or bacteria and less commonly other microorganisms, certain drugs and other conditions such as autoimmune diseases.Typical signs and symptoms include a cough, chest pain, fever, and difficulty breathing.t is usually caused by infection with viruses or bacteria and less commonly other microorganisms, certain drugs and other conditions such as autoimmune diseases. Typical signs and symptoms include a cough, chest pain, fever, and difficulty breathing.