Interstitial lung diseases (ILD)are uncommon, inflammatory and fibrotic processes. Affect interstitium but often also alveoli and airways. Goal is to make early dx and indentify those d/o which are treatable. Typically sub-acute, progressive SOB, DOE, chronic cough; can take months (or longer) prior to establishing dx - though AIP, COP, AEP tend to present acutely. For some connective tissue disorders (CTDs), lung findings and symptoms will pre-date the diagnosis of CTD. Symptoms suggestive CTD: Reynauds, muscle weakness, joint pain, dry eyes, dry mouth, GERD