A small Yale University study has drawn attention to people who say they developed long-term health problems after receiving a Covid vaccine.
Some individuals report ongoing symptoms such as severe fatigue, brain fog, dizziness, ringing in the ears, and exercise intolerance. Many say they felt dismissed or told their symptoms were due to anxiety or long Covid.
Researchers described a possible condition called post-vaccination syndrome. In the study, they found unusual immune patterns and, in some cases, signs of reactivated Epstein–Barr virus. However, the findings are early and based on a small group.
Scientists stress that the study does not prove vaccines caused these issues. Health experts continue to say Covid vaccines have saved millions of lives, while supporting further research into rare side effects.