> But thousands of people in the U.S. think they may have had other side effects that drugmakers and doctors never warned them about: unexpected changes in thei

> But thousands of people in the U.S. think they may have had other side effects that drugmakers and doctors never warned them about: unexpected changes in their menstrual cycles. [1] 1: https://www.npr.org/sections/health-shots/2021/08/09/1024190379/covid-vaccine-period-menstrual-cycle-research https://www.npr.org/sections/health-shots/2021/08/09/1024190...