Idiopathic pulmonary fibrosis is a type of lung disease that results in scarring (fibrosis) of the lungs for an unknown reason. Over time, the scarring gets worse and it becomes hard to take in a deep breath and the lungs cannot take in enough oxygen. IPF is a form of interstitial lung disease, primarily involving the interstitium (the tissue and space around the air sacs of the lungs), and not directly affecting the airways or blood vessels.
The two main symptoms of IPF are breathlessness and chronic cough. Other symptoms include chest pain or tightness, unexplained weight loss, loss of appetite, tiredness and loss of energy, and change of finger shape.
Idiopathic Pulmonary Fibrosis, The Lung Association (updated June 2, 2018), https://www.lung.ca/lung-health/lung-disease/idiopathic-pulmonary-fibrosis