A doctor has called for more studies into whether or not COVID-19 vaccines cause period changes after thousands of women have reported irregular menstrual cycles following the shots.
Dr Victoria Male, a lecturer in reproductive immunology at Imperial College London, said last year's clinical trials should have looked for abnormal menstruation.
At least 6,000 women in the U.S. report that their periods have come earlier than usual, felt heavier or just appeared irregular post-vaccination.
Additionally, more than 30,000 women in Britain have complained of suffering irregular periods after being jabbed.
Officials have stated that data 'does not support a link between changes to menstrual periods and COVID-19 vaccines since the number of reports is low relative to both the number of people vaccinated and the prevalence of menstrual disorders generally,' Male wrote in The BMJ.
'However, the way in which...data are collected makes firm conclusions difficult.'
She added that investigating such a link could calm fears that the vaccines are linked to infertility and increase confidence in the shots.
'Vaccine hesitancy among young women is largely driven by false claims that COVID-19 vaccines could harm their chances of future pregnancy,' Male wrote.
'Failing to thoroughly investigate reports of menstrual changes after vaccination is likely to fuel these fears.'
More than 6,000 women in the U.S. have reported heavier than normal or abnormal menstrual cycles to the CDC's reporting system post-Covid vaccination
A doctor has called for more studies into the link between irregular periods and COVID-19 vaccines, saying investigations could calm fears that the vaccines are linked to infertility and increase confidence in the shots (file image)
According to a DailyMail.com analysis of the Centers for Disease Control and Prevention's (CDC) Vaccine Adverse Event Reporting System, there have been at least 6,047 reports of U.S. women reporting abnormal menstrual cycles.
The most common complaint is heavy menstrual bleeding with 2,571 women reporting this symptom as of Thursday.
Other frequent reports include irregular menstruation, intermenstrual bleeding, menstruation delayed and abnormal uterine bleeding.
However, some women have experienced less common symptoms including an anovulatory cycle, which is when the release of an egg from the ovaries does not occur or superovulation,