Covid-19 Vaccines Linked to Menstrual Cycle Changes

Since widespread immunization against Covid-19 began last year, doctors and medical researchers have been fielding reports of painful cramps, delayed periods and other changes in menstrual cycles among some who got the vaccines. Now research confirms that the shots can affect menstrual cycles, with one recent study linking vaccination to a slight increase in menstrual-cycle length.

“It’s reassuring that it’s small,” Alison Edelman, a professor of obstetrics and gynecology at Oregon Health & Science University and one of the researchers who conducted the study, said of vaccines’ effect on menstrual cycles. “It’s also validating to individuals who experienced it.”