I'm almost afraid of finding out the stage. She has been hiding the symptoms so she could help take care of me, but she's been doing it for a while now with her O2 levels and deep breathing at the doctors office before they took her levels so it would be above 90. When I'd take it at home she would always say "Oh Ive always been a shallow breather. The airway that the node is bad is 90% blocked. there are 5 nodes on the right side and each one controls a different air passage.