1. Pain at the Injection Site
Probably the most common side effect people will feel is pain at the injection site. Over 92% of the people who took the Moderna vaccine reported feeling pain in their arms.
Not only that, but it’s possible that you’ll see some redness and swelling in your vaccinated arm. Even though that’s a common side effect, you should constantly watch it in case the swelling, redness, or pain becomes more than normal. And you should report it to your doctor if needed.