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3. Redness, Swelling, and Sore Arms

If you notice increased swelling or redness or endure discomfort in your arm after receiving the flu vaccine, you're experiencing what immunologists call a topical reaction. This is a telltale sign that your immune system functions well. However, if you experience extreme swelling at the injection site or any facial swelling, seek immediate medical attention because you may be allergic to the vaccine.

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This site offers information designed for educational purposes only. You should not rely on any information on this site as a substitute for professional medical advice, diagnosis, treatment, or as a substitute for, professional counseling care, advice, diagnosis, or treatment. If you have any concerns or questions about your health, you should always consult with a physician or other healthcare professional.