COVID Vaccines: What Science Says About Side Effects
COVID-19 vaccines transformed the global fight against the pandemic, but like any medical intervention, they come with a nuanced story. While millions received their shots safely, some individuals reported side effects—sparking important questions and ongoing research.
Fast Development, Worldwide Impact
Pfizer, Moderna, AstraZeneca, and Johnson & Johnson delivered vaccines at unprecedented speed. This rapid rollout was a historic achievement, but it also led to heightened scrutiny over potential safety risks.
What We Know About Side Effects
After nearly five years and hundreds of millions of doses administered, researchers have identified several possible side effects:
- Temporary high blood pressure
- Inflammation of the heart or its lining (myocarditis or pericarditis)
- Severe allergic reactions
- Changes in menstrual cycles, including heavier bleeding
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