Interstitial Lung Disease (ILD) is an umbrella term used for a large group of diseases that cause scarring (fibrosis) of the lungs. The scarring causes stiffness in the lungs which makes it difficult to breathe and get oxygen to the bloodstream. The outlook for interstitial lung disease is different for everyone. It is a progressive disease, and there is currently no cure for damage caused by scarring and inflammation. Medical treatments may help slow lung damage and help someone breathe, and in some cases, a lung transplant will be a necessity