My husband found out Oct 24, 2015 that he has stage IV lung cancer-- small cell, a very aggressive cancer. He started chemo in Nov. finished it in Feb. and is now in radiation. I will never forget that day in the ER when the doctor came in the ER room with the awful news. He lost 20 lbs quickly and his mood changed tremendously 4 months prior to diagnosis. If we would have had him into the doctor and had him checked out, it might not have advanced to stage IV. But 4 months later when he became short of breath with talking and wheezing, I knew that he must have lung cancer. I never would have guessed it would be so advanced. So listen to your body. Pay attention to loved ones and everyone who keeps telling you something's wrong with your spouse. Get a complete check up and chest scan.