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Probably the change of motion. You probably have motion sickness. Did you feel that way when the plane was taking off? If yes, then when the plane was at a stable motion, you felt nothing. But when it transitions to moving downwards, your body realized it and reacted. Its common

it might want to easily be rigidity. yet another probability is a few variety of odd hollow area on your chest it extremely is reacting to rigidity transformations. opportunities jointly with pleurisy, pneumothorax, pneumonia, or tuberculosis come to concepts. Ask your well being practitioner about it in basic terms to be on the secure area.