Menstrual changes after Covid vaccines may be far more common than previously known

Menstrual changes after Covid vaccines may be far more common than previously known A study found that 42% of people with regular menstrual cycles said they bled more heavily than usual after their Covid vaccination. NBC News

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An analysis published Friday in the journal Science Advances found that 42% of people with regular menstrual cycles said they bled more heavily than usual after vaccination. Meanwhile, 44% reported no change and around 14% reported a lighter period. Among nonmenstruating people — those post-menopause or who use certain long-term contraceptives, for example — the study suggests many experienced breakthrough or unexpected bleeding after their Covid shots...