Period pain: the line is function, not a number
Evidence last assessed 2026-10-14.
In short
- What the research shows
- Up to 90% have period pain; the line is when it affects daily life.
- What it doesn't show
- That line is a reason to get checked, not a diagnosis of the cause.
- Endometriosis
- PMOS
- Pelvic pain
- Cycles
See studies and method
What the evidence says
Up to 90% of women and girls have period pain, and about 1 in 5 young women miss school or study because of it. Yet most teenagers with period pain do not seek care, and many women put it off because they assume it is normal. The working line is function, not a pain score: period pain that affects your daily activities and quality of life is a reason to get checked.
A systematic review found period pain in 16% to 91% of women of reproductive age across studies, and severe pain in 2% to 29%. Among young women, 20.1% report missing school or university because of it and 40.9% say it hurts their concentration or classroom performance. A UK clinical review notes that most teenagers with period pain do not seek care. UK national guidance (NICE) lists period pain that affects daily activities and quality of life as a reason to suspect endometriosis, in adults and in girls aged 17 and under alike. It says everyone's experience of pain is their own, and that a normal examination or scan does not rule endometriosis out. Pain that keeps returning deserves a plan, not a shrug.
What this does not show
The function line is a threshold for getting checked, not a diagnosis. Pain below it can still deserve care, and nothing here says what is causing yours. The figures come from general and adolescent populations, not women with the condition: they say how common the experience is, never how severe yours should be. Pain that stops your life has many possible causes, endometriosis among them, and separating them is work you do with a clinician. None of this is a reason to wait: 'up to 90% have pain' says nothing about yours, and severe pain is never something you owe anyone acceptance of. The school and concentration figures (20.1% and 40.9%) were checked through other reports of the review, not the review's own summary.
Sources, as Neta holds them
Ju H, Jones M, Mishra G. The prevalence and risk factors of dysmenorrhea. Epidemiol Rev. 2014;36(1):104-13. doi:10.1093/epirev/mxt009
Systematic review
Armour M, Parry K, Manohar N, Holmes K, Ferfolja T, Curry C, et al. The prevalence and academic impact of dysmenorrhea in 21,573 young women: a systematic review and meta-analysis. J Womens Health (Larchmt). 2019;28(8):1161-71. doi:10.1089/jwh.2018.7615
Systematic review · 21,573 participants
Dixon S, Taghinejadi N, Holloway F, Papanikitas A, Vincent K. Supporting teenagers with period pain in general practice: clinical review. Br J Gen Pract. 2024;74:283-5. doi:10.3399/bjgp24X738489
marketing.learn.design.narrative_review
National Institute for Health and Care Excellence. Endometriosis: diagnosis and management. NICE guideline NG73. London: NICE; 2017 (last updated 11 November 2024). https://www.nice.org.uk/guidance/ng73
Guideline synthesis