However, the duration of the menstrual period was not affected. According to the researchers, the impact of vaccination on your period is small and likely to be temporary.
The vaccine-related change could be due to an immune system response to the vaccine, according to the researchers. A boosted immune system could therefore affect the so-called hypothalamus-pituitary-ovarian axis, which is also known as the “highway of communication between the brain and ovaries and uterus”.
Investigate further data
This effect seems to be most pronounced when vaccination occurs early in the follicular phase, which begins on the first day of menstruation and ends with the onset of ovulation. If two vaccinations with Biontech or Moderna fell on the same cycle, the bleeding was delayed by an average of two days. The researchers now want to collect more data to confirm a long-term return of the cycles to baseline. They also want to collect data from around the world to examine differences between individual vaccines.
Source: Nachrichten
