Endo & adeno, the full guide

The full guide to both conditions. Endometriosis affects roughly 1 in 10 people assigned female at birth; adenomyosis, its close sibling growing inside the wall of the uterus, affects up to 1 in 5. Both take years to diagnose and neither politely retires at menopause. The broad picture: what's happening, how they behave in the 40s when estrogen swings get bigger, what HRT decisions look like with a history of either, and why hysterectomy is only sometimes the end of it. If you want the day-to-day tracker for adenomyosis specifically (bleeding volume, clots, cramping), there's a companion page for that.

Endo and adeno are hormonal, immune and neurological at the same time. Knowing the moving parts, and where they differ, helps decisions later.

Endo grows outside the uterus, adeno grows inside its wall. Endometriosis lesions are most often on the ovaries (where they form chocolate cysts called endometriomas), the pelvic peritoneum, the bowel, the bladder, and the ligaments holding the uterus. Adenomyosis is the same kind of tissue burrowed into the muscular wall of the uterus itself, making it enlarged, boggy and painful. Same tissue logic, different address, which is why the experience overlaps so heavily and the two often co-exist.

Both are inflammatory diseases, not just 'painful periods'. Endo and adeno lesions secrete inflammatory cytokines and prostaglandins, recruit immune cells, and create chronic local inflammation that drives pain, adhesions and central sensitization over time. This is why fatigue, brain fog, gut issues and full-body pain are part of the picture for many people, it isn't only a pelvic problem.

Diagnosis is still slow and imperfect. Average diagnostic delay is 7 to 10 years for endo. Ultrasound and MRI can detect endometriomas, deep infiltrating endo, and adenomyosis (which has fairly characteristic imaging features, bulky uterus, junctional zone thickening, cysts in the muscle wall) but routinely miss superficial peritoneal endo. The historical gold standard for endo is laparoscopy with biopsy; adeno is increasingly diagnosable on a good MRI. A normal scan doesn't rule either out.

In perimenopause it usually gets worse before it gets better. Estrogen swings in perimenopause are bigger and more erratic than in the 30s, and bigger surges feed both endo and adeno. Many people describe theirs getting worse in their 40s: heavier bleeding, longer pain windows, more bowel involvement, a uterus that feels heavier and crampier than it used to. This is the rule, not the exception.

Neither always stops at menopause. Both are estrogen-driven, so for many people symptoms ease when periods stop. But not all. Fat tissue continues to make estrogen after menopause. Adhesions, scar tissue and nerve damage built up over decades don't disappear with the last period. And people on MHT can see disease activity restart, sometimes mildly, sometimes significantly. Post-menopausal endo and adeno are real and under-recognized.

Hysterectomy: curative for adeno, not always for endo. This is the biggest practical difference between the two. Adenomyosis lives in the uterine wall, so removing the uterus removes the disease, hysterectomy is genuinely curative for adeno. Endometriosis lesions live outside the uterus, so they remain after a hysterectomy unless they're also excised. 'I had a hysterectomy and the pain came back' is the classic endo story. For endo, excision of all visible disease by a specialist surgeon is what changes long-term outcomes, not the hysterectomy itself.

There's no single fix. The combination, hormonal suppression, expert excision when needed, pain modulation, gut and nervous-system care, is what moves the needle.

See an endo/adeno specialist, not just a general gynecologist. Outcomes for endo surgery vary enormously by surgeon experience. Look for an accredited endometriosis centre or a surgeon doing high-volume excision (not ablation). Adeno is more often managed medically or with hysterectomy, but a specialist can also offer uterine-sparing options like adenomyomectomy or uterine artery embolization if you're not done with the uterus yet. For complex disease, bowel, bladder, deep infiltrating endo, severe adeno, this is the single most important decision you'll make.

Hormonal suppression to stop the cycle. Continuous combined pill, the hormonal IUD (Mirena, particularly effective for adeno), progestin-only options (norethindrone, dienogest) and GnRH analogues all aim to stop the monthly proliferation that fuels both conditions. Each has trade-offs and they don't work equally for everyone, but for many people they buy years of better quality of life.

Excision surgery, not ablation, when endo surgery is on the table. For endo: excision (cutting the lesion out) has substantially better long-term outcomes than ablation (burning the surface). If a surgeon is recommending ablation, ask why and consider a second opinion at a specialist centre. For adeno, the surgical conversation is different, usually hysterectomy if you're done with the uterus, or uterine-sparing options (adenomyomectomy, embolization) if you're not.

Pelvic-floor physiotherapy. Years of pain create chronic pelvic-floor tightness, painful sex, bladder urgency and constipation, true for both conditions. A pelvic-floor physio trained in persistent pain is one of the most under-prescribed game-changers in endo and adeno care. Internal work matters; ask for it.

Anti-inflammatory eating, gently and consistently. Mediterranean-shaped eating, omega-3s, less ultra-processed food and less alcohol have evidence for lowering endo-related inflammation and pain over months, and the same logic carries over to adeno. Not a cure, not a moral test, one lever among several.

Pain modulation that respects how chronic this is. Long-term NSAIDs aren't sustainable. A multidisciplinary pain plan, TENS, heat, low-dose neuropathic agents (amitriptyline, gabapentin), pelvic-floor work, cognitive behavioural therapy (CBT) for chronic pain, sometimes low-dose naltrexone, works better than chasing the next flare with painkillers alone.

Mental-health support that takes the pain seriously. Living with under-believed pain for a decade leaves marks. Therapy with someone who understands chronic pelvic pain, not someone who'll suggest you 'manage stress better', is part of treatment, not an extra.

If you're considering MHT with a history of endo or adeno. MHT can be done with either history but the choice of formulation matters. For endo: estrogen-only MHT is generally avoided even after hysterectomy because residual lesions can re-activate. Continuous combined regimens (estrogen + progestogen, or tibolone) are usually preferred. For adeno: if the uterus is gone, the disease is gone, and MHT choices are more straightforward, but if you've kept the uterus, the same combined-regimen logic applies. This is a specialist conversation, not a default doctor one.