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2. Muscle Aches

The flu shot is an intramuscular injection, which means the needle is inserted straight into the muscle tissue. This causes microscopic injuries to the muscular cells. Ten to 64 percent of people who get intramuscular injections experience muscle aches in their upper arms or pain at the injection site.

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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.