Menstrual cycle alterations in reproductive age women after anti COVID-19 vaccination. A survey in 419 Italian women and quality of life and sexual function evaluation.

Background: Pharmacovigilance agencies did not collect data regarding menstrual changes after COVID-19 vaccination even if many women experienced it. Our aim was to evaluate whether COVID-19 vaccination is associated with secondary changes in menstrual cycle and to assess both quality of life (QoL) and sexual function (SF).

Methods: This study is a retrospective analysis referred to our Department from January 2021 to December 2021. The study cohort responded to same questionnaires before the second dose of vaccination (referring to previous 3 months) and 3 months after that (referring to three menstrual cycles after full-dose vaccination). The surveys administered were FSFI, FSDS, SF-36, MEDI-Q and the VAS-scale for dysmenorrhea.

Results: Four-hundred-nineteen vaccinated women were included in the study. The survey did not show a significant change in menstrual cycle length before and after COVID-19 vaccine (5.88±3.67 vs. 4.97±2.89, P=0.21); the interval between periods was significantly higher after a full-cycle vaccination (28.32±7.34 vs. 32.38±7.45, P<0.02); 32 patients (7.6%) developed amenorrhea after the second dose; VAS Scale did not change significantly (median range 3 (3-5) vs. 4 (3-6), P=0.20). MEDI-Q did not show significant variations before and after the vaccination (43.21±11.65 vs. 40.28±9.88, P=0.35). QoL and SF did not change significantly (FSFI median 27 [24-29] vs. 28 [25-30], P=0.12, FSDS median 9 [5-11] vs. 8 [4-12], P=0.22), SF-36 median 81 [70-85] vs. 82 [72-86], P=0.43).

Conclusions: COVID-19 vaccination is associated with a significant change in intervals between menstrual cycles without other alterations in menstrual characteristics, in QoL or SF.