Pneumonia is an infection that inflames the air sacs of the lungs and makes it hard to breathe. Learn about the types, stages, symptoms , causes, diagnosis, treatment, and prevention of pneumonia . What is pneumonia ? Pneumonia is an infection of the lungs. It causes the air sacs (alveoli) of the lungs to get inflamed (irritated and swollen). They may fill up with fluid or pus. This causes a variety of symptoms , which range from mild to severe. Pneumonia is usually caused by bacteria or a virus. It […] Learn how to tell the difference between pneumonia and a cold or the flu, and what to look out for in children and babies. Find out the common symptoms of bacterial, viral, and walking pneumonia , and when to call your doctor. Pneumonia is an infection of the lungs caused by bacteria, viruses, fungi, or parasites. Read on for more about the risk groups and treatments available.
