This is a crucial question for women and especially children in the context of potential longer term issues. About 66% of menstruating women are affected! Needs further clarification.
Link to the paper below:
Muhaidat, Nadia, et al. "Menstrual symptoms after COVID-19 vaccine: a cross-sectional investigation in the MENA region." International Journal of Women's Health 14 (2022): 395.
Sharing some of my autoimmune research to give a hypothesis as to the mechanism of the changes.
Why do menstrual irregularities occur after COVID-19 vaccination?