I m 67 in good health basically about 20 lbs overweight and take thyroid supplements..but lately I ve noticed when talking I run out of air during the end of my sentence and have to take another breath to finish. Also when I did the breath test at my physical a few months ago the reading showed I was only halfway into the tube upon exhaling. I am a bit hypothyroid now as well since my doc has been lowering my dose over the past year but has started bringing me back up since my fasting blood test was showing I was still too low. I gained weight, was cold, and tired most of the day. Could this be the reason for my breathing difficulties?