U.S. National Library of Medicine What are some symptoms of IPF? http://www.ncbi.nlm.nih.gov/pubmedhealth/PMH0001134/ Idiopathic Pulmonary Fibrosis idiopathic pulmonary fibrosis idiopathic pulmonary fibrosis What causes IPF? PubMed Health: Idiopathic Pulmonary Fibrosis idiopathic pulmonary fibrosis idiopathic pulmonary fibrosis