Anticovid vaccines generate effects on the hormonal cycle of women

Mild alterations occur in the menstrual cycle of women, after receiving the dose of the vaccine against Covid-19.

However, they are brief and minor changes compared to the natural variation of normal periods.

A study published in the British Medical Journal (BMJ), reflects the menstrual cycle is severely affected in women, with the anticovid vaccine.

These results, the reproduction specialist at Imperial College Lindo in the United Kingdom, Victoria Male, highlights as not worrying.

Male has been in charge of studying both works for the BMJ, and affirms that anticovid vaccines reflect alterations in the menstrual cycle. Despite this, he assures that the effects are not lasting or significant.

Study in American women

In the first study, 3,959 women in the United States were analyzed, of whom 2,403 were vaccinated. The rest of the participants were included in the control group. They each recorded six consecutive cycles on a tracking app.

Taking these factors into account, the specialists did not discover any type of change in the time of menstruation after the first dose. With the second dose, if a delay of 0.45 days could be seen.

Some 358 women showed visible effects, receiving the full dose in the same menstrual cycle. This caused a delay of 2.32 days of the following period. The 11% of this group had a change in cycle length of more than eight days, compared to 4% of the unvaccinated group record.

The reproduction specialist indicated that the groups returned to normal after two menstrual cycles, after receiving the vaccine.

Study in Norwegian women

In the second experiment, 5,688 Norwegian women were asked if they had any specific changes in their period from cycles before and after doses of the vaccine.

Among these changes, the following were taken into account: stronger than normal pain or unexpected bleeding. 38% of women reported cycle changes prior to vaccination. This figure increased after the first dose to 39%, and to 41% after the second dose.

The respondents concluded that the appearance of periods more intense than normal was the most common change after inoculation.

Male reported that the results are reassuring. He indicated that, after vaccination, there are changes in the menstrual cycle. However, they are small compared to natural variations and are also quickly reversed.

In some countries such as the United Kingdom, vaccination programs do not accept that both doses be given in the same menstrual cycle.