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 12:53pm
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Harvard School of Engineering and Applied Sciences
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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