Study: COVID-19 Vaccine Causes Temporary Changes to Menstrual Cycle

The COVID-19 injection may cause temporary changes to a woman’s menstrual cycle, according to a study published this week.

The study, published in the Obstetrics and Gynecology journal by the Oregon Health & Science University on Thursday, examined the menstruation data of nearly 4,000 people — vaccinated and unvaccinated — entered through an app called Natural Cycles.

Looking at six consecutive menstruation cycles, the researchers concluded that menstrual bleeding in vaccinated women was prolonged by less than a day, representing a “statistically significant” but not “clinically significant” change.

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