https://www.health.harvard.edu/staying-healthy/why-does-my-arm-hurt-after-i-get-a-shot
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11/18/22 at 8:53pm
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Harvard School of Engineering and Applied Sciences
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Arm tenderness is the most common side effect after vaccination. The injection stretches muscle fibers and triggers an immune response, causing discomfort. People can counter pain by moving the inj...
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