Sore arms. Headaches. Low-grade fevers.
These are some of the expected side-effects of a COVID-19 vaccine — a sign that the body’s mounting an immune response and learning how to fend off the novel coronavirus.
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. Though many researchers and gynecologists say a causal link hasn’t yet been established between the vaccines and the reported changes, that hasn’t stopped the worry among some people. And so far, scientists haven’t collected much data on whether or how the vaccines might affect a menstrual period.
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