Idiopathic pulmonary fibrosis (IPF) is a progressive disease (gets worse over time) isolated to the lung. It is a type of interstitial lung disease, which is a group of 200 diseases with similar symptoms but different causes. Currently, more than 80,000 adults in the United States have IPF, and more than 30,000 new cases are diagnosed each year

https://my.clevelandclinic.org/health/diseases/10959-idiopathic-pulmonary-fibrosis