The European Union (EU) European Medicines Agency (EMA) reported that it found no relationship between changes in menstrual cycles and COVID-19 vaccines, after a study in Norway suggested that some women had periods more abundant after being inoculated.
A study by the Norwegian Institute of Public Health (FHI) published Tuesday asked nearly 6,000 women between the ages of 18 and 30 about their menstrual cycles and bleeding patterns before and after vaccination. The article has not yet been peer-reviewed.
The first results showed that 7.6% reported heavier periods before the first vaccination, which increased to 13.6% after; and 8.2% before the second dose, which rose to 15.3% after the second injection.
“More studies measuring hormone levels etc. will be needed to fully determine this,” said Georgy Genov, head of pharmacovigilance at the EMA.
It also stated that it was important to note that the menstrual disorders observed in the emerging studies had been transitory.
The FHI indicated that young women who experienced persistent and heavy menstrual bleeding after receiving the COVID-19 vaccine may need to delay another vaccine until the cause is investigated and symptoms have ceased. They should also consult their doctor to rule out other conditions that may require treatment.
In case of temporary menstrual changes in a regular cycle, the next dose of the vaccine can be given as planned.
Genov said the agency has no data to show that vaccines, including COVID-19, affect people’s fertility.
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