What are the problems with the Moderna COVID vaccine?

Written by Editorial Team | Last Updated: August 2026

The Moderna COVID-19 mRNA vaccine, while demonstrating high efficacy in preventing severe illness, is associated with certain side effects, clinical risks, and post-authorization complications. Common acute reactions reported during clinical trials and widespread rollouts include localized pain, swelling, and redness at the injection site, alongside systemic symptoms like fatigue, headaches, muscle aches, chills, and low-grade fevers. Furthermore, rare but serious adverse events identified through public health surveillance include severe allergic reactions like anaphylaxis, as well as cases of myocarditis and pericarditis, which have been observed predominantly in adolescent and young adult males within several days following administration.

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