Stanford Medicine study shows why mRNA COVID-19 vaccine can cause myocarditis, P4
- Shidonna Raven

- Aug 18
- 1 min read
December 10, 2025
Updated on: June 29, 2026
Source: Sranford University
Photo / Image Source: Unsplash,
One rare but real risk of the mRNA-based COVID-19 vaccines is myocarditis, or inflammation of heart tissue. Symptoms — chest pain, shortness of breath, fever and palpitations — appear in the absence of any viral infection. And they happen quickly: within one to three days after a shot. Most of those affected have high blood levels of a substance called cardiac troponin, a well-established clinical indicator of heart-muscle injury. (Cardiac troponin is normally found exclusively in the heart muscle. When found circulating in blood, it indicates damage to heart muscle cells.)
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