It is common, and consistently missed. Endometriosis affects around one in ten women of reproductive age, some 190 million people, about as common as type 2 diabetes in that age band 1. Yet diagnosis takes several doctors and years. Pain gets blamed on IBS, anxiety, or stress, and until recently confirming it required surgery, so many women were told nothing was wrong because nobody looked.
A normal scan does not rule it out. The most common form is thin and surface-level, largely invisible on ultrasound and MRI 2. Since 2022 surgery is no longer required to diagnose it: a symptom history plus a scan by someone trained in endometriosis imaging is enough to start treatment. A clean scan alongside classic symptoms is a reason to treat, not to send her home 34.
The pattern to recognise. None confirms it alone; together they should trigger the conversation.
- Period pain that interferes with life: missing school or work, pain ibuprofen barely touches, vomiting or fainting on the worst day, worsening year by year.
- Pain spread past the period: deep pain during or after sex, pain emptying the bowel or bladder, pelvic pain between periods.
- Trouble getting pregnant. About half of women present this way rather than with pain.
A mother, sister, or daughter with confirmed endometriosis raises the odds five- to sevenfold and lowers the threshold to investigate 5.
Go in naming it, and don't accept "come back if it gets worse."
Treatment works, and fast. First line is suppressing the cycle so lesions stop bleeding, usually a continuous contraceptive pill or a progestin like dienogest or a hormonal IUD. Roughly two in three women get meaningful pain relief within three to six months 3. For the rest, newer GnRH-antagonist tablets or specialist surgery fill the gap 6.
- Weeks: the worst day of the period, the one spent on the bathroom floor, is usually first to go.
- Months: for most, pain drops below the level that ran the week.
- Longer: fatigue, brain fog, and painful sex ease, and the depression and anxiety built up over the years lift with the pain 7.
The fine print โ when to skip it, and what people get wrong
Pregnancy and hysterectomy do not cure it; lesions outside the uterus persist. "Bad-looking disease means worse pain" is false too. A tiny lesion on a nerve can hurt more than a large ovarian cyst.
Recurrence after surgery is routine: pain returns within a year for roughly one in five, which is why hormonal suppression normally continues afterward 3. Treat this as a long-managed condition rather than a one-shot fix.
Fertility is a separate track: monthly conception runs two to ten per cent against 15โ20% in fertile couples, so raise plans early 1. Diagnosed women should also stay in gynaecology care long-term for a small raised risk of two uncommon ovarian-cancer subtypes 8.
- 1Zondervan KT, Becker CM, Missmer SA (2020). Endometriosis. New England Journal of Medicine. link
- 2Nisenblat V, Bossuyt PM, Farquhar C, Johnson N, Hull ML (2016). Imaging modalities for the non-invasive diagnosis of endometriosis. Cochrane Database of Systematic Reviews. link
- 3Becker CM, Bokor A, Heikinheimo O, Horne A, et al. (ESHRE Endometriosis Guideline Group) (2022). ESHRE guideline: endometriosis. Human Reproduction Open. link
- 4NICE (2024). Endometriosis: diagnosis and management (NG73). link
- 5Rahmioglu N, Mortlock S, Ghiasi M, et al. (2023). The genetic basis of endometriosis and comorbidity with other pain and inflammatory conditions. Nature Genetics. link
- 6Taylor HS, Giudice LC, Lessey BA, et al. (2017). Treatment of endometriosis-associated pain with elagolix, an oral GnRH antagonist. New England Journal of Medicine. link
- 7Facchin F, Buggio L, Ottolini F, et al. (2023). The impact of endometriosis on depressive and anxiety symptoms and quality of life: a systematic review. Frontiers in Public Health. link
- 8Pearce CL, Templeman C, Rossing MA, et al. (2012). Association between endometriosis and risk of histological subtypes of ovarian cancer: a pooled analysis of case-control studies. Lancet Oncology. link
Related in the handbook (7)
- โ Suppressing the cycle with hormonal contraception is usually the first-line move against the pain.
- โ Years of pelvic pain train the pelvic floor to clench; PT often eases the pain that lingers even after the lesions are treated.
- โ Adenomyosis and endometriosis often occur together and overlap in symptoms; both need imaging to sort out.
- โ Heavy, soak-through periods often travel with endometriosis โ both are reasons severe symptoms deserve a workup, not a shrug.
- โ Endo on the bowel mimics IBS - bloating, pain, bathroom changes. Many women carry an IBS label for years before the real cause is found.
- โ A pain-and-cycle log can surface endometriosis years before it would otherwise be named.
- โ Fibroids are another common cause of heavy, painful periods โ worth ruling in or out alongside endometriosis.