Why did the covid vaccine hurt my arm so badly? I thought it was just a normal shot.

My arm felt like it was on fire and now it feels like someone punched it. The whole upper arm from the arm pit to the elbow hurts.

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ElwoodBlues · M

All that pain indicates a strong antibody reaction to the vaccine with plenty of inflammation.

Here's a theory about why you had a particularly strong antibody reaction - it's because unbeknownst to you, you already had Covid, possibly an asymptomatic case.