Oct. 2, 2023
Research by the Norwegian Institute of Public Health, Norway, suggests that COVID-19 vaccines or the body's response to them can lead to unexpected vaginal bleeding in women. This phenomenon was observed in women across different reproductive stages.
In a paper, "Unexpected vaginal bleeding and COVID-19 vaccination in nonmenstruating women," published in Science Advances, the team of public health researchers detail their findings that raise the possibility that the spike protein of the SARS-CoV-2 virus, which is targeted by the vaccines, might be involved in this phenomenon.
The study investigated the association between COVID-19 vaccination and unexpected vaginal bleeding in non-menstruating postmenopausal, perimenopausal, and premenopausal women. The study included approximately 22,000 participants, aged 32 to 64, from the Norwegian Mother, Father and Child Cohort Study (MoBa) and the Senior cohort, ages 65 to 80.
Unexpected vaginal bleeding was reported in 3.3 percent of postmenopausal women, 14.1 percent of perimenopausal women, and 13.1 percent of premenopausal women, more than three times the expected rates. Around half of the women who reported unexpected vaginal bleeding experienced it within 28 days after a COVID-19 vaccination.
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