What Is Idiopathic Pulmonary Fibrosis?

Pulmonary (PULL-mun-ary) fibrosis is a condition in which tissue deep in your lungs becomes thick and stiff, or scarred, over time. DCI Home: Lung Diseases: Idiopathic Pulmonary Fibrosis: What Is ... Pulmonary (PULL-mun-ary) fibrosis is a ...