One other thing to contemplate for anyone who has a little shortness of breath or chest tightness on exertion - ask to have your blood iron and B vitamin levels tested. They should do a cbc, ferritin, total iron, iron binding capacity, a b12, b6, and thiamin. D and A couldn't hurt either.

I had that same feeling - in an older man you get sent to the cardiologist / physically all fine, but I was very iron deficient, borderline anemic, and very low b12. Iron pills and a monthly b12 shot have worked out great, fast cheap and easy cure.

While probably NOT likely, if anyone has unexplained shortness of breath, dizziness, or nausea on exercise. Low ferritin is a pretty unrecognized problem until it falls totally off the chart and anemia develops. If other things check out, heart and lungs check into that. Labs are cheap or free under most insurance, the cure can cost like $8-$10 a month.