Pneumonia is an infection caused by a bacteria or virus that fills up the lungs with fluid or pus, causing the alveoli (air sacs) to get irritated and swollen. This may result in a variety of symptoms, ranging from mild to severe. Pneumonia can as well be caused by irritants or fungi that you breathe into your lungs. The severity of this infection depends on many factors which include; your age, the cause of pneumonia ...