Idiopathic pulmonary fibrosis is a disease of the lower respiratory tract that damages the air sacs (alveoli) and leads to reduced transfer of oxygen to the blood. It causes widespread scarring of the lung. The condition is believed to result from an inflammatory response to an unknown agent -- "idiopathic" means no cause can be found. The disease occurs most often in people between 50 and 70 years old.
| 
