A study from Obstetrics & Gynecology discovered that females who received one dose of a COVID-19 vaccine during their menstrual cycle extended their cycles by nearly one day in comparison to unvaccinated people.
Experts pointed out that menstrual cycles naturally vary in length from month to month and that this change is extremely minor. However, this small change indicates that the vaccines could influence symptoms of the menstrual cycle, like pain, mood changes, or heaviness of flow.

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