
397 - Endometriosis and adenomyosis: diagnosis, fertility, reproductive aging, & emerging treatments
This transcript summarizes a conversation about endometriosis and adenomyosis, two related but distinct uterine conditions.
Endometriosis: The Basics
- Definition: Tissue similar to the uterine lining (endometrium) grows outside the uterus, e.g., on fallopian tubes, ovaries, bladder, or bowel.
- Prevalence: Affects ~10% of reproductive-age women (≈200 million globally). Among infertile women, the rate is 30-50%.
- Symptoms (The '6 Ds'): Dysmenorrhea (painful periods), Deep Dyspareunia (pain during sex), Dyschezia (pain with bowel movements), Dysuria (pain with urination), Infertility (difficulty conceiving), and chronic pelvic pain.
- Pain Mechanisms: Three types: nociceptive (direct from lesion), neuropathic (nerve infiltration), and nociplastic (central sensitization – the pain system is stuck in 'on' mode).
Causes & Risk Factors
- Genetics: ~50% heritable; 7x higher risk if a mother/sister is affected.
- Retrograde Menstruation: 90% of women have some backward flow of menstrual blood. Normally cleared by the immune system; in endometriosis, this clearance is impaired.
- Modern Lifestyle: Today's women have ~400 menstrual cycles (vs. ~100 historically). Fewer pregnancies, shorter breastfeeding, and earlier first period (age 12 vs. 16) drastically increase retrograde flow events.
Adenomyosis vs. Endometriosis
- Adenomyosis: Endometrial-like tissue grows within the uterine muscle (myometrium). Previously called 'internal endometriosis.'
- Prevalence: Even more common than endometriosis (20-30% of women). Up to 70% of endometriosis patients also have adenomyosis.
- Symptoms: Mostly heavy bleeding and painful periods. Caused by tissue injury and repair (TIA) as tissue invades the junctional zone.
- Comparison to Fibroids: Fibroids are benign nodules that are often asymptomatic and can disrupt anatomy. They are not the same as adenomyosis or endometriosis.
Diagnosis: Early Detection is Key
- Problem: Diagnostic delay is 5-12 years (≈6 years in the US). Reasons: normalization of pain, lack of a blood test, reliance on surgery (laparoscopy) for diagnosis.
- New Guidelines (ACOG, March 2025): Allow for a clinical diagnosis based on symptoms and treatment without upfront surgery. Goal: shorten suffering.
- Imaging: Specialized transvaginal ultrasound (with bowel prep) and MRI (non-contrast, T1/T2) can now detect >95% of deep lesions. Standard ultrasound has low sensitivity.
- Key Takeaway: 'If you have pain and a normal ultrasound report says you don't have endometriosis, don't believe it. You need a specialized exam.'
Treatment & Fertility
Medical (for pain, not trying to conceive):
- First-line: Birth control pills (low-dose estrogen + progestin) or progestin-only (e.g., Dienogest pill, Mirena IUD). They suppress ovulation and menstruation to calm the lesions.
- If resistant: Consider surgery (laparoscopy). Crucial: Start medication immediately post-surgery, or recurrence is 10% per year.
Fertility (in IVF context):
- Main obstacle: Mechanical (blocked tubes) rather than biological (egg quality is similar). The uterine lining is likely not the main problem.
- Surgery before IVF: Helpful for large endometriomas (>5-6 cm), but risk: removing healthy ovarian tissue.
- Adenomyosis & IVF: The diseased uterus disrupts implantation and can cause miscarriage (especially at 6-8 weeks). Solution: Medically shut down the ovaries (e.g., with GnRH agonists like Leuprolide) for 2-4 months to calm the uterus. Success rates then become similar to women without adenomyosis.
Common mistakes:
- Operating when central sensitization is already present (surgery won't fix that pain).
- Removing endometriomas before egg retrieval (significantly lowers ovarian reserve).
- Not removing damaged fallopian tubes (hydrosalpinx): they secrete toxins that reduce implantation by up to 50%.
Emerging Treatments
- Biologics: HMI115 (antibody targeting prolactin receptor) is in phase 3 trials. Could be the first non-hormonal treatment for endometriosis.
- Awareness: Pushing for earlier diagnosis and better funding (currently 15x less than for diabetes) is seen as critical.
- If you suffer from pelvic pain, painful periods, or pain during sex/bowel movements, don't take 'no' for an answer. Insist on specialized imaging (e.g., MRI or expert protocol ultrasound).
- A diagnosis is not a dead end but the start of a plan. 'Patients often cry from relief when they finally hear their pain has a name.'
- Early treatment prevents not only unnecessary suffering but preserves fertility and prevents painful brain rewiring (central sensitization).
Keywords: Endometriosis, Adenomyosis, Retrograde Menstruation, Endometrium, Infertility, IVF, Pelvic Pain, GnRH Agonist




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