Stanford Study Pinpoints Cause of Vaccine-Linked Myocarditis and a Possible Fix

New research uncovers the immune reactions behind rare heart inflammation cases following COVID-19 mRNA vaccination.

Pfizer-BioNTech COVID-19 (L) and Moderna COVID-19 vaccines at Borinquen Health Care Center in Miami on May 29, 2025. Photo illustration by Joe Raedle/Getty Images

Myocarditis from COVID-19 vaccines is caused by two chemicals acting together, according to a new Stanford study published on Dec. 10.

“As a cardiologist, we get asked all the time, ‘How exactly does [the vaccine cause myocarditis?]’” Dr. Joseph Wu, the study’s lead author and director of the Stanford Cardiovascular Institute, told The Epoch Times. “We thought it was a very important scientific and clinical question to spend resources [on] and tackle.”