![]() ![]() We don’t yet fully understand the biological mechanism behind cycle changes linked to COVID vaccines. Similarly, a 1982 study on hepatitis B and a more recent one on HPV found changes to menstrual cycles following vaccination. A 1913 study showed heavier bleeding after typhoid vaccination. Reports of cycle changes after vaccination is not a new phenomenon. Prostock-studio/Shutterstock Why might these changes happen? Many people have reported changes to their period after COVID vaccination. Similarly, a study of 2,269 women in the Middle East and north Africa found that women reported menstrual irregularities such as longer periods and longer cycles (more time between periods) after vaccination. Other studies have also found changes in periods following vaccination.įor example, a study of almost 4,000 participants in the US found that after a second vaccine people started their period on average just over half a day later than expected.Ī Norwegian study of more than 5,500 people found that over 7% of participants experienced heavier and longer periods after receiving their first COVID vaccine dose. Over one-third of those on gender-affirming treatment (which eliminates menstruation) experienced breakthrough bleeding. In the second group, two-thirds of post-menopausal participants and people on long-acting reversible contraceptives (such as IUDs and implants) reported breakthrough bleeding after COVID vaccination. In the group who regularly menstruate, 42% reported a heavier period after their vaccine, 44% reported no change, and 14% reported a lighter period. The study excluded anyone who had had COVID. The latter group could include people who have been through menopause, people receiving gender-affirming treatment, or people using hormonal contraceptives that suppress menstruation. ![]() The results are based on responses from 39,000 people who regularly menstruate or who have done so in the past. Most participants had received either the Pfizer or Moderna vaccines. For this analysis, all participants had been fully vaccinated, meaning they had received two doses at least 14 days before completing the survey (boosters were not yet available at the time). It also asked about COVID vaccination status. The survey asked for demographic information and included questions about people’s periods, from symptoms to timing and bleeding duration. The researchers, based in the US, launched an online survey in April 2021, which was advertised through multiple channels, including TV news, Twitter, blogs and radio. The largest study yet on this topic has just been published, finding that 42% of people who regularly menstruate reported a heavier period after COVID vaccination. Meanwhile, many people have reported changes to their menstrual cycles after COVID vaccination. People have reported changes to their menstrual cycles after having COVID, from the timing of their period, to its duration, to bleeding (a heavier or lighter flow). For many people who menstruate, one of the pandemic’s effects has been on periods. COVID has affected countless aspects of our lives.
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