Akman AO, Bozdag G, Kizilkan MP, et al. - Researchers conducted this prospective cohort study to assess the presence of anovulation in adolescents with primary dysmenorrhea (PD). Between September 2018 and September 2019, healthy female adolescents (aged 11 to 18) with regular menstruation with a score of 1-3 according to ‘Numerical rating scale’, and grade 0 (no limitation for daily activities, no analgesic need and systemic symptoms) according to the 'Verbal multidimensional scoring system' were enrolled as the control group. Suprapubic pelvic ultrasound and luteal SP levels were used for the determination of ovulation. Contrary to the classical information, anovulatory cycles are not uncommon in PD patients, and pain severity is comparable during these cycles. More research is needed to shed light on the pathogenesis of PD in adolescents.