What are the common side effects of the Moderna COVID-19 vaccine that I may experience?

The side effects of the Moderna vaccine were generally mild and temporary, including pain at the injection site, headache, fever, fatigue, chills and muscle and joint pain.

About 85% of participants reported pain at the injection site. Other local reactions included redness, swelling at the injection site, and swollen lymph nodes (about 5-15% each). No participants reported severe local reactions.

Systemic reactions were also generally mild to moderate in severity. Most began 1 or 2 days after receipt of the vaccine and resolved within 1-2 days after they began. Systemic reactions were more common after the second dose. In general, both local and systemic reactions were more frequent in younger adults.