Medically reviewed by Dr. Shweta Agarwal, MBBS, DGO. Last updated: June 2026.
Information on this page is educational and does not replace a medical consultation. Outcomes depend on individual clinical factors.
What exactly is adenomyosis, and how is it different from endometriosis and fibroids?
Adenomyosis, endometriosis, and uterine fibroids are three distinct — though sometimes coexisting — uterine conditions. Adenomyosis is endometrial-like tissue embedded within the myometrium, making the entire uterine wall thicker and more diffusely enlarged. Endometriosis, by contrast, is endometrial-like tissue growing outside the uterus entirely — on ovaries, fallopian tubes, or the pelvic lining. Uterine fibroids are discrete, well-defined benign muscle tumours arising within or on the uterine wall — a fundamentally different process from the diffuse tissue infiltration seen in adenomyosis.
All three can coexist in the same woman. Research suggests that a proportion of women with endometriosis also have adenomyosis, and adenomyosis may be found alongside fibroids on imaging — making a precise clinical assessment important before planning management.
Adenomyosis may affect the entire myometrium (diffuse adenomyosis) or appear as a localised pocket of tissue called an adenomyoma — a focal accumulation that can be mistaken for a fibroid on ultrasound.
In Marathi and Hindi, adenomyosis is referred to as गर्भाशय एडिनोमायोसिस — a term your doctor may use when explaining the condition.
What causes adenomyosis, and who is at risk?
The underlying cause of adenomyosis is not fully established, and several mechanisms are likely involved. Proposed explanations include:
- Disruption of the endometrial–myometrial border: Uterine trauma — from childbirth, caesarean section, curettage (D&C), or other uterine surgery — may allow endometrial tissue to penetrate the muscular wall. This explains why adenomyosis has historically been associated with women who have had previous pregnancies or uterine procedures. However, adenomyosis is increasingly recognised in younger women who have never been pregnant, suggesting this alone is not the complete picture.
- De novo metaplasia: Uterine muscle cells may transform directly into endometrial-like tissue, without prior disruption — similar to the coelomic metaplasia theory proposed for endometriosis.
- Hormonal dependence: Like endometriosis, adenomyosis is oestrogen-dependent. It tends to be more active during the reproductive years and typically regresses after menopause as oestrogen levels fall.
- Inflammatory and immune factors: Altered local immune responses within the myometrium may facilitate the persistence and growth of endometrial tissue within the muscle wall.
Risk factors commonly cited include prior uterine surgery, multiple pregnancies (multiparity), and possibly prior uterine instrumentation — though adenomyosis clearly also occurs in women with none of these factors. Age at diagnosis tends to be in the 30s–40s, though this may partly reflect when investigations are performed rather than when the condition begins.
What are the symptoms of adenomyosis?
Symptoms can range from absent — adenomyosis discovered incidentally on imaging during an infertility evaluation — to severely disabling. The most common include:
- Heavy menstrual bleeding (menorrhagia): Often progressive, with periods becoming heavier over time. This is the most frequently reported symptom and can lead to anaemia with fatigue.
- Painful periods (dysmenorrhoea): Severe cramping pain through the lower abdomen and lower back; often more intense than typical period pain and poorly relieved by standard painkillers.
- Chronic pelvic pain: Persistent lower abdominal discomfort, particularly in the days before and during menstruation.
- Uterine enlargement: The uterus may feel enlarged, tender, or "bulky" on clinical examination or pelvic ultrasound.
- Abdominal bloating or fullness: A feeling of pressure or heaviness in the lower abdomen.
- Difficulty conceiving: Adenomyosis can impair implantation and is associated with higher miscarriage risk — discussed further below.
Not all women with adenomyosis have symptoms. Symptom severity does not reliably reflect the extent of disease on imaging — some women with extensive adenomyosis have mild symptoms, and others with limited changes report severe impact on daily life.
Overlap with menstrual disorders such as heavy menstrual bleeding and with endometriosis is common, which is why a careful diagnostic assessment matters.
How is adenomyosis diagnosed?
Clinical history and examination
Dr. Shweta Agarwal begins with a thorough history of your menstrual pattern, pelvic pain, pregnancy history, and any difficulty conceiving. A pelvic examination may reveal an enlarged, tender, and uniformly "boggy" uterus — a clinical finding that raises suspicion for adenomyosis.
Transvaginal ultrasound (TVS)
Transvaginal ultrasound is the first-line investigation. Ultrasound features suggestive of adenomyosis include a globular, asymmetrically enlarged uterus; heterogeneous myometrial echotexture (uneven muscle texture); myometrial cysts; and an ill-defined or irregular endometrial–myometrial junction (junctional zone). The accuracy of ultrasound depends on examiner experience and ultrasound equipment quality. TVS can also identify coexisting fibroids, endometriomas, or other pelvic pathology at the same appointment.
MRI
MRI provides the most accurate non-invasive assessment of adenomyosis. It allows detailed visualisation of the junctional zone — the boundary between the endometrium and the myometrium. A junctional zone thickness of ≥12 mm on MRI is a commonly used supportive criterion for adenomyosis, but MRI findings are interpreted with the full clinical and imaging picture rather than by a single cut-off alone (per 2023 Ultrasound in Obstetrics & Gynecology review). MRI is particularly useful when ultrasound findings are equivocal, when distinguishing a focal adenomyoma from a fibroid, or when deep infiltrating endometriosis is also suspected.
What about biopsy or surgery?
Historically, adenomyosis could only be definitively confirmed on histological examination of a hysterectomy specimen. Today, high-resolution transvaginal ultrasound and MRI allow reliable non-invasive diagnosis in most cases, without requiring surgery. Endometrial biopsy does not diagnose adenomyosis (the tissue is in the muscle wall, not the cavity lining). Diagnostic laparoscopy may be performed when coexisting endometriosis needs to be assessed or treated — see laparoscopy for more.
How does adenomyosis affect fertility and pregnancy?
The relationship between adenomyosis and fertility is an active area of research and the evidence is still evolving. Current understanding suggests adenomyosis may impair fertility through several mechanisms:
- Impaired endometrial receptivity: The altered uterine environment — disrupted junctional zone, inflammatory mediators within the myometrium, altered gene expression in the endometrium overlying adenomyotic tissue — is thought to reduce the capacity for embryo implantation.
- Disrupted myometrial contractility: The uterus has subtle peristaltic movements that help transport sperm toward the fallopian tubes and facilitate implantation. Adenomyosis disrupts these contractions.
- Association with miscarriage: Systematic reviews have reported an association between adenomyosis and higher miscarriage risk in some women, including in assisted conception populations (per Human Reproduction 2014 meta-analysis). The evidence is not entirely consistent across studies, and causality is difficult to establish because adenomyosis often coexists with endometriosis and other factors.
It is important to say clearly: adenomyosis does not mean infertility is inevitable. Many women with adenomyosis conceive naturally or with fertility treatment. The impact on any individual woman depends on the extent of adenomyosis, its distribution, whether other conditions coexist, ovarian reserve, and partner factors. Management is therefore always individualised — a fertility assessment with Dr. Shweta Agarwal is the starting point.
What are the management options for adenomyosis?
Adenomyosis has no medical treatment that eliminates the condition without removing the uterus. Management is therefore directed toward your specific goals — symptom relief, fertility, or both.
Symptom management (when fertility is not the immediate focus)
- Levonorgestrel-releasing IUD (e.g. Mirena): An intrauterine device that releases a progestogen locally; reduces menstrual bleeding and pain significantly in many women with adenomyosis, without systemic side effects.
- Combined oral contraceptive pill or progestogen-only pill: Suppresses endometrial activity, reducing bleeding and pain; not suitable when trying to conceive.
- GnRH analogues (e.g. leuprolide, triptorelin): Induce a temporary low-oestrogen state; can substantially reduce adenomyosis activity, uterine volume, and symptoms. Not suitable for long-term use due to bone density effects. Used in specific contexts pre-IVF (see below).
- NSAIDs: For pain management during menstruation; supportive rather than disease-modifying.
Management for women trying to conceive
For women with adenomyosis pursuing fertility, management is highly individualised. GnRH agonist "down-regulation" before IVF or frozen embryo transfer has been studied as a strategy to suppress adenomyosis activity and potentially improve uterine receptivity, but the evidence is mixed and an optimal protocol duration has not been firmly established (per Human Reproduction Update 2012 systematic review). This approach is sometimes used in clinical practice for moderate-to-severe adenomyosis, but is not universally indicated and the decision is made on a case-by-case basis.
IVF with personalised stimulation and transfer protocols remains the primary fertility treatment when adenomyosis is moderate to severe, when other fertility factors coexist, or when simpler approaches have not resulted in pregnancy. Where coexisting endometriosis is present, laparoscopy may be indicated to assess tube patency and treat endometriotic lesions — though adenomyosis within the myometrium cannot be surgically removed without risk in the same way.
Hysteroscopy may be relevant when the uterine cavity needs to be assessed or when a submucosal component or polyp coexists — it does not treat adenomyosis itself but helps evaluate the cavity before transfer.
Surgical options
- Conservative excision (focal adenomyoma): For well-defined focal adenomyosis, surgical excision may be considered in specialised centres. However, complete removal is difficult, recurrence is common, and there is a risk of weakening the uterine wall — which carries implications for future pregnancy and the mode of delivery. This option is discussed on a highly individual basis.
- Hysterectomy: The only definitive cure for adenomyosis. It is appropriate for women who have completed their family and whose symptoms significantly impair quality of life despite other management. It is not a fertility-preserving option and is never first-line for women still trying to conceive.
Treatment cost varies by pathway. Final cost depends on individual clinical evaluation — see Costs & EMI for current pricing.
When should I seek an evaluation for adenomyosis?
Consult Dr. Shweta Agarwal if:
- Your periods have become progressively heavier, longer, or more painful over time.
- Menstrual pain is severe enough to disrupt daily activities, work, or study.
- An ultrasound has found a "bulky uterus" or heterogeneous myometrium, and no one has explained what this means.
- You have been trying to conceive for 6 months or more (or 12 months if under 35 with no additional symptoms) without success.
- You have had IVF cycles that did not result in pregnancy and adenomyosis has not been formally assessed.
- You have been diagnosed with endometriosis — adenomyosis may coexist and affect your management plan.
A fertility assessment at Aansh includes pelvic ultrasound, hormone evaluation, and review of any prior imaging — providing the complete picture needed to plan your care.