--- title: What are the menstrual cycle patterns and how common are PMS and PCOS in young Korean women? description: PMS affected 25.5% of participants and PCOS affected 5.2%. Most women with regular periods had normal cycle length (93% had 21-35 day cycles) and normal durat url: https://niyora.com/research/papers/menstrual-cycle-patterns-and-the-prevalence-of-premenstrual-syndrome-and-2021/ --- - [Niyora](https://niyora.com/) - [Research](https://niyora.com/research/) - [Library](https://niyora.com/research/library/) - What are the menstrual cycle patterns and how common are PMS and PCOS in young Korean women? Survey study, 2021 # What are the menstrual cycle patterns and how common are PMS and PCOS in young Korean women? PMS affected 25.5% of participants and PCOS affected 5.2%. Most women with regular periods had normal cycle length (93% had 21-35 day cycles) and normal duration, though 55.9% reported heavy bleeding. Moderate study design 462 Korean young women, with 88 having additional blood tests ## What they did 462 Korean women completed questionnaires about menstrual health. 88 women with irregular periods had blood tests and body composition measured. ## What they found Among women with regular periods: 11.7 cycles per year average, 93.0% had normal cycle frequency (21-35 days), 95.2% had normal duration (2-7 days), and 55.9% reported heavy menstrual bleeding. PMS prevalence was 25.5% and PCOS was 5.2%. Women with irregular periods had more underweight and obese women and more weight and diet changes. ## What it means for you This describes how common PMS is in young Korean women and shows that irregular periods are linked to weight changes. The study is limited to Korea, so patterns may differ elsewhere. 25.5% Prevalence of PMS 55.9% Women with heavy menstrual bleeding 5.2% Prevalence of PCOS ## About the study Original title Menstrual Cycle Patterns and the Prevalence of Premenstrual Syndrome and Polycystic Ovary Syndrome in Korean Young Adult Women Authors Park YJ, Shin H, Jeon S et al. Journal Healthcare (Basel, Switzerland) Year 2021 Study design Survey study Participants 462 What was tested None Open access Yes Read the paper [doi.org/10.3390/healthcare9010056](https://doi.org/10.3390/healthcare9010056) Original abstract Menstruation is one of the important indicators of reproductive health. Therefore, in order to improve the reproductive health of women in puberty and early adulthood, it is necessary to investigate menstrual health and symptoms. This cross-sectional descriptive correlational study was conducted to identify young women's menstrual cycle patterns, prevalence of Premenstrual Syndrome (PMS), Polycystic Ovary Syndrome (PCOS) and the relationships of health-related factors according to menstrual regularity and PCOS. 462 women participated in the first phase of the study and completed the menstrual health and health-related behaviors questionnaire. In the second phase, 88 women with irregular menstruation in phase one had blood tests taken and body composition measured. As a result, Menarche was slightly later in irregular menstruation group. Women with regular menstruation had a mean number of 11.7 menstrual cycles over the past year, 93.0% of them reported a normal menstruation cycle frequency (21-35 days), 95.2% reported a normal duration (2-7 days) and 55.9% of participants had heavy menstrual bleeding. In the irregular menstrual group, there were higher percentages of underweight and obese women as well as more women experiences weight and diet changes. The estimated prevalence rates of PMS and PCOS were 25.5%, 5.2% respectively. This study provides updated basic data about menstrual health among Korean young women but more extensive and sophisticated studies are needed in the future. Reproduced under CC-BY. ## Topics [Premenstrual syndrome (PMS)](https://niyora.com/research/topics/condition-pms/)[Polycystic ovary syndrome (PCOS)](https://niyora.com/research/topics/comorbidity-pcos/)[Work and productivity](https://niyora.com/research/topics/life-area-work/)[Adolescents and young people](https://niyora.com/research/topics/life-area-adolescents/) Research tells you what helps on average. Niyora helps on the day it hits. Calm down, see it another way, and decide what to say, with a PMS and PMDD app built by a doctor. ## Related studies Study, 2024 How do menstrual hormones affect sleep? Systematic review, 2025 Does alcohol use affect menstrual health in teenage girls? Systematic review, 2024 How common is premenstrual syndrome in Africa, and what factors increase the risk? Systematic review, 2020 How common is PMS among women of reproductive age in Ethiopia? Systematic review, 2010 Does acupuncture treat premenstrual syndrome? Survey study, 2026 Are menstrual characteristics linked to depression and anxiety in teenage girls? Ask AI about this page Copy prompt ChatGPT ↗ Claude ↗ Perplexity ↗ Google AI Mode ↗ Grok ↗