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Why does my arm hurt after a shot? Sore arm, strong immunity! If your arm is feeling a bit tender after getting your seasonal vaccines, you're not alone. This pain is a good sign that your immune system is making antibodies in response B12 Shots Dosage for Adults: How Much and How Often What Does Arm Pain After the Depo Shot Mean? How Quickly Does a B12 Shot Work? Benefits & What to Expect B12 Shots at Home: How, Where & How Often to Inject Yourself AZ IV Medics
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