What it means
Endometriosis is a long-term condition where tissue similar to the uterine lining grows outside the uterus — commonly on ovaries, fallopian tubes, bladder, bowel or the pelvic lining. It is often described as “endometriosis-like tissue”, because it is not identical to the lining.
It is very common, often takes years to be diagnosed, and has effective treatments. The gap between those three facts is the main problem, and it has a cause: the average patient waits years for a diagnosis, often because pain is repeatedly dismissed as “just bad periods”.
What can vary
Symptoms and their pattern matter more than any single feature:
- Severe period pain, often worse over time and sometimes starting before bleeding begins
- Pain with sex, particularly deep pain
- Pain when opening the bowels or passing urine, especially during periods
- Pain sitting for long periods, or a general pelvic ache
- Fatigue that does not match what you have done
- Difficulty conceiving
- Symptoms that are worse on one side
Less common presentations include bowel symptoms around periods, and referred pain in the lower back.
It is possible to have endometriosis and no symptoms, and to have severe symptoms and no endometriosis. Neither exists confirms or rules it out by itself.
Possible explanations
Diagnosis is clinical — based on your history and an examination — and usually confirmed by laparoscopy, a keyhole procedure where tissue can be seen directly and sampled. Ultrasound and MRI can support but do not reliably rule it in or out, particularly for superficial disease.
Many clinicians now offer a trial of treatment as part of diagnosis, which is practical and pragmatic but does suit everyone.
Why it is often missed
The reasons are worth naming because they affect how you should approach a clinician:
- Period pain is widely normalised, including by clinicians.
- Women and people with a vagina are more likely to have their pain attributed to something emotional.
- Symptoms that are cyclical can be dismissed as “just stress”.
- It takes time to be referred, because the first-line advice for period pain is pain relief.
Warning signs
- Period pain severe enough to miss school, work or socialising, or not helped by anti-inflammatory painkillers
- Pain with sex
- Pain opening the bowels during periods
- Difficulty conceiving alongside painful periods
- Symptoms that are worsening over time
What to do next
Say what the pain does to your life, not just that you have pain. “It stops me going to school two days a month” is actionable. “It hurts” is easy to reassure.
Ask to be referred to a gynaecologist, and say the word “endometriosis” if you suspect it — that is entirely legitimate and it changes the referral pathway.
If you feel dismissed, it is legitimate to ask for a second opinion. Second opinions covers how.
Self-care
Endometriosis is manageable, and self-care has a real role even though it does not treat the condition itself:
- Anti-inflammatory painkillers, taken at the first sign rather than waiting, if you can take them
- Heat
- Gentle movement — some people find exercise helpful, others find it worsens symptoms during flares; both are normal
- Regular, adequate sleep
- Track symptoms so you can show a pattern
When to seek help
Routine: any persistent pelvic pain.
Prompt: any of the warning signs above.
Emergency: sudden severe pelvic pain that is worsening, particularly if you could be pregnant.
How to talk about it
“My period pain is so bad I miss school and ibuprofen doesn’t touch it.”
“I have deep pain during sex and I’ve never mentioned it because I didn’t think it counted.”
“I’ve had this pain for two years and I want to know about endometriosis.”
The middle one is the sentence that most often finally gets someone referred.
Related articles
Sources
Public sources are linked so you can read the detail rather than take this site’s word for it. None of this has yet been reviewed by a qualified clinician — see how we handle medical review.
References
Where this comes from
Linked so you can check it against a recognised public health source rather than take this site's word for it.
- Endometriosis — NHS NHS (opens in a new tab)
- Endometriosis — ACOG American College of Obstetricians and Gynecologists (opens in a new tab)
These are public sources from recognised health organisations, linked so you can read the detail rather than take this site's word for it. Reading them does not tell you whether any of it applies to you, and none of these articles has yet been reviewed by a qualified clinician. How we handle sourcing and review.