Endometriosis
Not bad period pain — a disease, and one that takes seven years to name
What it is
Endometriosis is a chronic inflammatory disease in which tissue resembling the lining of the uterus grows outside it — on the ovaries, the pelvic peritoneum, the bowel, the bladder, occasionally further afield. It affects roughly 1 in 10 women and people with a uterus of reproductive age, which makes it about as common as asthma or diabetes. It causes severe period pain, chronic pelvic pain, pain during sex, pain on opening the bowels, cyclical bowel and bladder symptoms, fatigue, and subfertility. It is not 'bad periods'. It is a disease, and it takes an average of seven to eight years to diagnose — one of the worst diagnostic delays in medicine.
Why it matters
Because the delay is not a resource problem, it is a knowledge and attitude problem, and both are fixable. Two beliefs cause most of it. The first is that severe period pain is normal — which means the symptom is not reported, and when it is reported it is not investigated. The second is far more damaging and is held by clinicians as often as patients: THAT A NORMAL SCAN RULES IT OUT. It does not. Superficial peritoneal endometriosis, the commonest form, is INVISIBLE ON ULTRASOUND AND MRI. A normal scan excludes endometriomas and deep disease; it excludes nothing else. Every year of delay is a year of pain treated as a personality trait, and for some, a year of fertility.
What BioSignal knows about treating this
What works for Endometriosis
BioSignal’s clinical summary, most important first.
- TAKE THE PAIN SERIOUSLY AND GET ASSESSED — period pain that stops you living your life is not normal and is not a threshold to be endured. This is the intervention that shortens the seven-year delay, and nothing further on this list happens without it
- DO NOT ACCEPT 'YOUR SCAN WAS NORMAL' AS A DIAGNOSIS OF EXCLUSION — the commonest form of endometriosis is invisible on every scan that exists. A normal ultrasound rules out endometriomas. It does not rule out endometriosis
- Analgesia — NSAIDs are first-line for pain and are more effective than paracetamol here
- Hormonal suppression to stop or lighten periods: the combined pill taken continuously, progestogens, or the levonorgestrel intrauterine system. These do not cure the disease, but they suppress the cyclical stimulation that drives the pain, and they work for many people
- GnRH agonists with add-back therapy — for disease not controlled by first-line hormonal treatment, under specialist care
- Surgical EXCISION of endometriosis by a specialist centre — the evidence favours excision, and outcomes depend heavily on surgical expertise. This is a referral worth insisting on
- Fertility care where conception is the goal — endometriosis is associated with subfertility, and hormonal suppression is contraceptive, so the treatment plan changes completely if pregnancy is wanted
- Multidisciplinary chronic pain support — endometriosis pain can persist after the lesions are treated, because chronic pain rewires the pain system. Saying so is not saying the pain is imaginary
Signal Records relevant to this condition
Interventions and contributing factors — some of these records describe a cause rather than a cure. The rating shown is BioSignal’s confidence in that Signal Record, not a claim about how well it treats this condition. Open any of them for the full evidence.
- Curcumin (Turmeric)Limited evidence
Thousands of studies, no approved drug — because curcumin is barely absorbed and a known false positive in lab assays. Modest osteoarthritis relief is its one credible claim.
- Omega-3 Fatty AcidsModerate confidence
Lowers triglycerides, and reduces preterm birth in pregnancy. Routine fish oil does NOT prevent cardiovascular disease, cancer or dementia in the general population. High-dose omega-3 increases atrial fibrillation risk — a real harm most bottles do not mention.
- Vitamin DHigh confidence
Effective for deficiency and for bone health in at-risk groups. For broad disease prevention in adults who are already replete, the largest trials are null — and confidence in that null is high. Routine testing of healthy adults is not supported.
New to this? Read these first
How this usually unfolds
- Recognize risk factors
- Get diagnosed
- Track key biomarkers
- Lifestyle first
- Evidence-based treatment
- Long-term monitoring
Who is at risk
- Family history — a first-degree relative with endometriosis substantially raises risk
- Early menarche and short menstrual cycles
- Nulliparity
- Prolonged exposure to menstruation (more cycles over a lifetime)
- Heavy or prolonged menstrual bleeding
- NOTE: there is no lifestyle cause, and nothing the person did brought this on. It is not caused by stress, by diet, or by 'not relaxing enough'
How it's diagnosed
Endometriosis is diagnosed on the SYMPTOM PATTERN first, and imaging second — and this order matters enormously, because the historical order was the reverse and it produced the seven-year delay. The pattern is cyclical, worsening pain: period pain that stops you working or studying, chronic pelvic pain, deep pain with sex, pain on defecation or urination that is worse around the period, and subfertility. Transvaginal ultrasound and MRI can identify endometriomas and deep infiltrating disease — but a NORMAL scan does not exclude endometriosis, because the commonest (superficial peritoneal) form cannot be seen on any scan. Laparoscopy was long treated as the mandatory gold standard; current guidance is explicit that treatment should NOT be delayed while waiting for it. Empirical treatment is legitimate and is often the fastest route to relief.
Key biomarkers
Lifestyle
Explore this condition across BioSignal
Related Foundations
Related Signal Records
Frequently asked questions
Is severe period pain normal?
No. Period pain that is manageable with over-the-counter painkillers and does not stop you doing things is common. Pain that makes you vomit, that keeps you off work or school, that no painkiller touches, or that has you lying on the floor is NOT normal, and it is not a threshold of endurance you are supposed to meet. It is a symptom. The single most common reason endometriosis takes seven years to diagnose is that this pain is reported late — and then normalised when it is reported. If that describes you, it is worth being specific with a clinician: not 'my periods are bad', but 'my period pain stops me working'.
My scan was normal. Does that mean I don't have endometriosis?
No, and this is the most consequential misunderstanding in the whole area — held by clinicians as often as by patients. The most common form of endometriosis is superficial peritoneal disease, and it is INVISIBLE on ultrasound and on MRI. Scans are good at finding endometriomas (cysts on the ovary) and deep infiltrating disease. They cannot see the rest. So a normal scan rules out those things and rules out nothing else. If your symptom pattern fits endometriosis and your scan was normal, the correct next step is not reassurance — it is a conversation about treatment or referral.
Will pregnancy cure my endometriosis?
No. This is one of the most persistent and most harmful pieces of advice given to people with this disease. Symptoms often improve DURING pregnancy, because periods stop — and they very commonly return afterwards. Pregnancy is not a treatment for endometriosis, and telling someone in severe pain to have a baby is not medical advice. It has also, historically, been given to people who could not conceive precisely because of the disease.
Will a hysterectomy cure it?
Not necessarily, and this surprises people. Endometriosis is tissue OUTSIDE the uterus — so removing the uterus does not remove the disease. Hysterectomy can help where adenomyosis (endometrial tissue within the muscle of the uterine wall) is a major driver, or where bleeding is the dominant problem. But endometriosis on the peritoneum, bowel or ovaries remains behind unless it is also excised. People have had hysterectomies expecting a cure and been devastated when the pain continued.
Does endometriosis cause infertility?
It is associated with subfertility, but it is not a sentence, and many people with endometriosis conceive without help. The relationship is not simple: severe disease can distort the pelvic anatomy, but even superficial disease is associated with reduced fertility for reasons not fully understood. What matters practically is this: hormonal treatment for endometriosis works by suppressing the cycle, and is therefore contraceptive. If you are trying to conceive, the treatment plan is a different conversation — and it should be started earlier rather than later, because time matters.
Is endometriosis linked to cancer?
There is a small increase in the risk of certain ovarian cancers (clear cell and endometrioid subtypes) in people with endometriosis. The word doing the work in that sentence is SMALL: the absolute risk remains low, the great majority of people with endometriosis will never develop ovarian cancer, and this is not a reason for alarm. It is a reason to be honest, and to take persistent new symptoms seriously rather than assuming everything is 'just the endo'.
Evidence summary
Endometriosis is a chronic inflammatory disease affecting roughly 10% of women and people with a uterus of reproductive age, with a mean diagnostic delay internationally of seven to eight years. Symptom severity correlates POORLY with the extent of disease seen at surgery — a person with minimal visible disease can be in extreme pain, and extensive disease can be near-silent, which is one reason imaging-led diagnosis fails. Normal transvaginal ultrasound and MRI do NOT exclude endometriosis, because superficial peritoneal disease is not visible on either; current guidance explicitly states that treatment should not be delayed pending diagnostic laparoscopy. Hormonal suppression (continuous combined oral contraception, progestogens, the levonorgestrel intrauterine system, GnRH agonists with add-back) reduces pain in randomized evidence but is suppressive rather than curative and is contraceptive. Surgical excision by experienced surgeons improves pain and, in some, fertility; outcomes are strongly operator-dependent. Endometriosis is associated with subfertility and with a small absolute increase in clear cell and endometrioid ovarian cancer risk. There is no validated blood test and no evidence that pregnancy or hysterectomy reliably cures the disease.
References & sources
- NICE NG73 — Endometriosis: diagnosis and management
- ESHRE — Guideline on the management of endometriosis
- Cochrane reviews of hormonal and surgical treatment for endometriosis-associated pain
- Cohort studies of diagnostic delay in endometriosis
- Studies of endometriosis and ovarian cancer subtype risk
Educational information — not medical advice
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