This can be caused by chest wall pain which will hurt your chest or it could be pleurisy which is fluid build-up in the lungs and can hurt into the back as well. It will not cause shortness of breath but it will cause pain when you use your chest and back muscles to breath and move. When you lie down and are in a prone position it can actually stretch these muscles and that is why standing is more comfortable.
*Cheryl K* Please click the
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