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> RECORD OBS-0550 | status: PARTIALLY SUBSTANTIATED | filed 2026-07-31
Home > Health > COVID-19 vaccines cause heart conditions, blood clots or stroke

COVID-19 vaccines cause heart conditions, blood clots or stroke

RecordOBS-0550
CategoryHealth/Vaccines
StatusPARTIALLY SUBSTANTIATED
SummaryProponents claim that COVID-19 vaccines cause heart conditions, blood clots, or stroke. Some specific claims include myocarditis, blood clot syndrome, and stroke risk in older adults.
OriginArose during the COVID-19 vaccination rollout, with rare side effects reported and amplified.
Claimed
  • COVID-19 vaccines cause blood clots.
  • COVID-19 vaccines are linked to a higher risk of stroke.
  • COVID-19 vaccines cause heart conditions such as myocarditis or pericarditis.
Evidence / consensusThe COVID-19 vaccines available in the U.S. do not cause blood clots in general. There is a rare link to myocarditis/pericarditis, especially in young men, and a rare blood clot syndrome with the J&J vaccine. The benefits outweigh the risks.
> OBSERVER NOTE:
Rare side effects exist but are far less common than complications from COVID-19 infection. Surveillance systems monitor these risks.

Sources

  1. Debunking COVID-19 myths - Mayo Clinic

Sources are external and provided for verification. Listing does not imply the Observer endorses their claims.