Tag: Arm pain

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Why does my arm hurt 3 days after a tetanus shot? Understanding Delayed Soreness

Oct 12, 2025 •

4 min read

According to the CDC, pain at the injection site occurs in about 2 in 3 adults who receive the Tdap vaccine [1.4.4]. If you're wondering 'Why does my arm hurt 3 days after a tetanus shot?', it's typically due to your body's normal immune response.