Affects alveoli which become inflamed and flooded with

fluid. Caused by infection and in choke caused as a result of gastro-oesophageal reflux which

may enter the trachea. May also result from chemical or physical irritation of the lungs or as

the result of another medical illness, such as lung cancer. The most common cause is

bacteria pneumonia, caused by the bacteria Streptococcus pneumoniae. People with

infectious pneumonia often have a cough that produces greenish or yellow sputum and a

fever. Dyspnoea is also common, as is chest pain. Possible hemoptysis (coughing up blood,)

experience headaches. A - Normal lung x-ray B- Chest X-ray with extensive pneumonia in

right lung.

This chest x-ray in a patient with a cough and fever showed a white area (yellow circle) in the right lower lung