What effect will the covid-19 vaccine have on the female body? The most direct physical response may be changed in the menstrual cycle, and the monthly menstrual period is a barometer of physical health for women.
A recent study by Oregon Health & Science University followed approximately 4,000 U.S. women (2,403 vaccinated; 1,556 unvaccinated; percentages who received the Pfizer-BioNTec vaccine) 55%, Moderna and Johnson/Jensen each accounted for 35% and 7%.), they experienced a total of 6 menstrual cycles. The results of the study, released Wednesday, found that menstruation generally came about a day later than usual after the vaccine. However, after receiving the covid-19 vaccine, the total number of menstrual days did not change.
Dr. Alison Edelman of Oregon Health and Science University, who led the study, said: "The results of this study have brought many women's hanging heart stones to the ground! It is still necessary to educate women about the impact of the covid-19 vaccine on the body.”
According to the International Federation of Obstetricians and Gynecologists, changes in cycle length for periods of less than eight days are normal, according to Dr. Kristin Metz, a biologist and professor of molecular medicine at the Feinstein Institute for Medical Research in Manhasset.
Dr. Metz said many factors are known to affect the length of the menstrual cycle, including diet, sleep and exercise, as well as illness, travel and stress. The Covid-19 vaccine has affected people in different forms, including injection site pain, nausea, aches and pains, fever and fatigue, and the more severe ones can lead to insomnia, loss of appetite, and feelings of depression. In addition, vaccination can affect the secretion and stabilization of estrogen, progesterone, follicle-stimulating hormone, luteinizing hormone, and other hormones related to female reproduction, thereby shortening or prolonging the duration of the menstrual cycle.
A woman's menstrual cycle is the length of time from the first day of menstruation to the first day of the next cycle. In fact, slight changes from month to month are normal, and stress, diet, and even exercise can cause temporary changes. Edelman said the study included women with the "most normal" menstrual cycle, which averaged between 24 and 38 days.
The researchers tracked vaccinated women for 3 cycles before and 3 after vaccination, including the month they were vaccinated and compared them with unvaccinated women. Among the 358 women who were vaccinated against Covid-19 during the same menstrual cycle, their next menstrual cycle was slightly more variable, averaging two days. About 10 percent of them had a change of eight days or more, but then returned to the normal range, the researchers report in the Journal of Obstetrics & Gynecology.
"One theory is that our biological clocks, or the substances that control the menstrual cycle, may snooze when the immune system ramps up at certain times of the menstrual cycle," said Dr. Edelman, he plans to pursue further research to help Find out if there are changes in menstrual flow, or if women with irregular periods respond differently.
Research results in the United States show that it is normal and reasonable for women to have menstrual changes caused by the covid-19 vaccine and that some fluctuating reactions caused by estrogen are not harmful to the body.