A Stanford Medicine research team has confirmed that mRNA-based COVID vaccines can cause inflammation of the heart muscle, known as myocarditis, which can be fatal.
The study, recently <a href="https://med.stanford.edu/news/all-news/2025/12/myocarditis-vaccine-covid.html">published</a> in the journal &#8220;Science Translational Medicine,&#8221; concludes that these mRNA vaccines can trigger certain immune cells to produce inflammatory proteins, specifically CXCL10 and IFN-gamma, which can cause heart issues.
“It’s not a heart attack in the traditional sense,” Dr. Joseph Wu, a senior author of the study and the director of the Stanford Cardiovascular Institute, explained. “There’s no blockage of blood vessels as found in most common heart attacks. When symptoms are mild and the inflammation hasn’t caused structural damage to the heart, we just observe these patients to make sure they recover.”
Some patients, though, can suffer severe complications, including death, Wu said.
The researcher confirmed that COVID itself &#8220;can cause myocarditis,&#8221; and &#8220;to a lesser extent, so can the mRNA vaccines.&#8221;
For reasons still unknown, the vaccines are tied to a heightened risk in males under the age of 30, particularly those who receive multiple doses, the study found.
&#8220;Vaccine-associated myocarditis occurs in about one in every 140,000 vaccines after a first dose and rises to one in 32,000 after a second dose,&#8221; Stanford Medicine News Center <a href="https://med.stanford.edu/news/all-news/2025/12/myocarditis-vaccine-covid.html">said</a>. &#8220;For reasons that aren’t clear, incidence peaks among male vaccines age 30 or below, at one in 16,750 vaccines.&#8221;
Recently, U.S. Food and Drug Administration (FDA) vaccine chief Dr. Vinay Prasad proposed in an internal memo an overhaul to how vaccines are evaluated and approved, basically initiating tougher standards.
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This would reportedly include full randomized clinical trials even for updated or routine vaccines, like the flu shot. The changes would allow for an evaluation of real-world protection, not just antibody levels, as well as rates of side effects, and more information on risk-benefit analysis. 
Notably, the memo cited at least 10 children who died “after and because of” receiving COVID vaccines as the apparent driving force behind the tougher vaccine standards.
The medical establishment quickly revolted over the proposed standards. For example, twelve former FDA officials denounced the memo in an editorial, claiming it casts doubt on vaccine safety. They also said the new standards “reject long-standing science” and will slow innovation. 
In response to the backlash from the establishment, Health and Human Services (HHS) press secretary Emily Hilliard told The Daily Wire that the American people “deserve evidence-based science,” and said Dr. Prasad’s email “lays out a philosophical framework that points us toward that higher standard.”
Hilliard also said HHS will “soon release documents laying out that framework” as well as data confirming how the COVID-19 vaccine resulted in children’s deaths that &#8220;previous leadership failed to properly investigate.”
The FDA is also currently <a href="https://www.washingtonpost.com/health/2025/12/09/vaccine-covid-coronavirus-safety-fda/">investigating</a> adult deaths connected to the COVID vaccines.
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Stanford Researchers Confirm COVID Vax Can Cause Fatal Myocarditis

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Stanford Researchers Confirm COVID Vax Can Cause Fatal Myocarditis