A study shows that COVID-19 vaccines can make women's periods last longer, coming months after another paper found the shots are linked to increased menstural bleeding.
A team of researchers led by Dr. Alison Edelman, professor of obstetrics and gynecology at Oregon Health & Science University, analyzed about 20,000 vaccinated and 5,000 unvaccinated women around the world. They obtained their data from a period-tracking app called Natural Cycles.
The team found that any COVID-19 vaccine can extend the menstrual cycle. Women who got the shot experienced approximately a one-day delay in getting their periods, compared with women who did not.
Researchers noted that the study did not include women who were taking birth control pills, were between the ages of 18 and 45, and had regular menstrual cycles before getting the vaccine.
On average, vaccinated women experienced a 0.71-day increase after the first shot and a 0.56-day increase after the second. Those who got both doses in a single menstrual cycle had a 3.91-day increase in the cycle length, researchers found.
Women who were younger and who had longer cycle length before they got vaccinated were more likely to experience an increase, the study said.
Increased BleedingIt comes several weeks after a study linked increased menstrual bleeding to COVID-19 vaccines. In July, published in Science Advances, researchers found that 42 percent of respondents reported bleeding more heavily than usual after receiving the shot.
Last month, top federal COVID-19 adviser Anthony Fauci drew flack from doctors after he told Fox News about reported COVID-19 vaccine-linked menstrual irregularities.
That drew rebuke from Dr. Christiane Northrup, a former fellow in the American College of Obstetricians and Gynecologists.
“Unfortunately, the menstrual problems we are seeing are far from transient and temporary,” she told The Epoch Times in August. “Many women have been bleeding daily or having heavy, irregular, painful periods for an entire year.