Several women say they have experienced heavier and more painful periods since getting the COVID-19 vaccine, with some also revealing that they have had breakthrough bleeding in the middle of a cycle after getting the shot.
Dr. Kate Clancy, an associate professor at the University of Illinois, tweeted in February that she’d been hearing about people who had experienced changes in their menstruation since getting one or two vaccine shots.
Her Twitter thread has prompted more women to share their own menstrual concerns, revealing their heavy flow, worsened cramps, and irregular timing since getting the jab — with one woman saying she spent 16 days bleeding after getting the Johnson & Johnson shot.