Adenomyosis
The overlooked twin of endometriosis.
Often not considered or missed, adenomyosis causes heavy bleeding, pain, and fertility challenges. Here’s how we diagnose and treat it.
A Common Yet Neglected Disease
Understanding Adenomyosis
Adenomyosis affects millions of women worldwide, but often goes undiagnosed or unrecognized, despite its significant impact on quality of life. For many, it can be a hidden source of pelvic pain, heavy bleeding, and fertility struggles that are too often dismissed. Gaining clarity about adenomyosis is essential for accurate diagnosis and for creating treatment plans that truly address the root of a patient’s symptoms.
What is it?
Adenomyosis is a condition where endometrial-like tissue grows into the muscular wall of the uterus (the myometrium). This can lead to an enlarged uterus, painful periods, heavy bleeding, and fertility challenges.
When can it happen?
Adenomyosis is thought to impact between 20% and 35% of women of reproductive age. However, the true prevalence of the condition may be underestimated due to the invasive nature of diagnostic procedures and non-specific symptoms.
Why does it occur?
The exact cause of adenomyosis is not fully understood, but genetic, hormonal, and immune factors are thought to play a role. Ongoing research suggests it is likely a multifactorial condition influenced by several overlapping biological processes.
Where can it spread?
Unlike endometriosis, adenomyosis does not spread outside the uterus. It remains within the muscular wall of the uterus itself, though it can be diffuse or form localized growths called adenomyomas.
Comparing the Conditions
Similarities to Endometriosis
Endometriosis and adenomyosis share a defining feature: tissue resembling the uterine lining that grows where it shouldn’t, yet still responds to hormonal cycles. In endometriosis, this tissue implants outside the uterus; in adenomyosis, it burrows into the uterine muscle itself. In both cases, the tissue swells and bleeds with each cycle, but because it has no normal way to exit the body, it sets off chronic inflammation, scarring, and pain. These changes can ripple outward, affecting fertility, sexual health, and day-to-day function. While most common in women of reproductive age, both conditions may also persist beyond menopause, underscoring how complex and long-lasting their impact can be. Though their root causes are still under study, evidence suggests overlapping genetic, hormonal, and immune pathways that make them deeply interconnected yet uniquely challenging to diagnose and manage.
Comparison Continued
Differences
Although endometriosis and adenomyosis share certain features, they differ in ways that have important implications for diagnosis, treatment, and patient care. These distinctions affect where and how the conditions develop, how often they occur, and what tools doctors use to identify and manage them. Understanding these differences helps patients and providers choose the most effective strategies for relief and long-term health.
Anatomical Location
The key distinction lies in where the endometrial-like tissue is found. In endometriosis, it grows outside the uterus—commonly on the ovaries, fallopian tubes, peritoneum, and sometimes even beyond the pelvis. Adenomyosis, on the other hand, occurs when this tissue penetrates into the uterine muscle wall (myometrium), causing the uterus itself to enlarge and become more tender.
Prevalence
Endometriosis is estimated to affect about 1 in 10 women of reproductive age, while adenomyosis is thought to impact closer to 1 in 3. Both figures are likely underestimates, as many cases go unrecognized due to vague symptoms and the challenges of making a definitive diagnosis without invasive procedures. This means the real burden of disease may be much greater than currently reported. For instance, some studies suggest adenomyosis may be present in up to 70% of women and it can persist well into menopausal years.
Diagnosis
Confirming each condition requires different approaches. For endometriosis, minimally invasive surgery such as laparoscopy or robotics remains the gold standard, as it allows direct visualization and removal of lesions when needed. Adenomyosis is more often suspected through imaging like ultrasound or MRI, but can usually only be definitively confirmed when the uterus is surgically removed and examined under a microscope. In select cases, discrete adenomyomas can be removed while leaving the uterus intact, though this is not always possible when the disease is widespread.
Treatment
Management for both conditions may include hormonal therapies—such as oral contraceptives, progestins, or GnRH agents—along with integrative strategies like nutrition and lifestyle changes to reduce inflammation and balance hormones. However, surgical choices diverge significantly. Endometriosis is typically treated with laparoscopic or robotic excision of ectopic tissue, preserving fertility whenever possible. In severe adenomyosis, hysterectomy may be considered if childbearing is no longer desired, though in some cases targeted removal of adenomyomas allows the uterus to be preserved. Each decision is highly individualized, balancing symptom control, reproductive goals, and overall health.
Why these Differences Matter
Knowing the differences between endometriosis and adenomyosis is only the first step—what matters most is how these insights are applied to your personal care. Our comprehensive evaluation and diagnosis process is designed to uncover the true source of your pain and guide you toward the right treatment path.
When Endo and Adeno Overlap
Condition Associations
Endometriosis and adenomyosis often overlap, with research showing that adenomyosis is more common in women who already have endometriosis. When the two conditions coexist, symptoms can intensify, making diagnosis and management more complex.
Chronic Pelvic Pain
Persistent pain is common in both disorders and can significantly affect daily life and functioning.
Uterine fibroids
Adenomyosis may occur alongside fibroids (leiomyomas), adding to the challenges of accurate diagnosis and effective treatment.
Autoimmune and Inflammatory Diseases
Endometriosis is associated with a higher risk of autoimmune conditions such as rheumatoid arthritis, lupus, and inflammatory bowel disease, and early evidence suggests adenomyosis may share some of these links.
Mental Health
Living with chronic pain and fertility challenges contributes to higher rates of depression, anxiety, and reduced quality of life in patients with either condition. This is why it is our mission to help as many patients as possible.
Looking Ahead
Research & Future Directions
Research into endometriosis and adenomyosis continues to expand, offering hope for earlier diagnosis, better treatments, and deeper understanding of how these conditions develop. Key areas of focus include:
Biomarkers
Scientists are working to identify reliable biomarkers that could detect endometriosis and adenomyosis through blood or other non-invasive samples, allowing for earlier diagnosis and intervention.
Non-Invasive Imaging
Advances in ultrasound and MRI technology aim to improve accuracy in detecting these conditions without the need for invasive procedures, making diagnosis easier and safer.
New Therapies
Targeted hormonal treatments, immunomodulators, and anti-inflammatory agents are being studied as potential ways to relieve symptoms, preserve fertility, and address disease progression.
Genetic & Epigenetic Insights
Ongoing research is exploring the genetic and epigenetic mechanisms behind these conditions, with the goal of uncovering their root causes and guiding the development of more precise therapies.
Common Questions
What does a globular uterus mean on ultrasound?
A “globular uterus” on ultrasound means the uterus looks more rounded and bulky than the typical pear shape, often because the uterine muscle is enlarged. It’s a descriptive imaging term—not a diagnosis by itself—but it commonly shows up when adenomyosis is suspected.
Adenomyosis is when tissue similar to the uterine lining grows into the uterine muscle, which can make the uterus feel tender and look enlarged. Many people with this finding also have symptoms like painful periods, heavy or prolonged bleeding, pelvic pressure, or fertility challenges, though symptoms and imaging don’t always match.
If your report mentions a globular uterus, the next step is usually to interpret it alongside other ultrasound features (and sometimes MRI) and your specific symptoms and goals. Our team can help you make sense of the imaging language, evaluate for adenomyosis and common overlaps like endometriosis or fibroids, and map out options—from symptom control to fertility-focused planning and surgical treatment when appropriate.
What does junctional zone thickening on MRI mean?
“Junctional zone thickening” on MRI means the inner muscle layer of the uterus (the junctional zone, right next to the uterine lining) looks thicker and often less uniform than expected. This finding is commonly associated with adenomyosis, a condition where endometrial-like tissue grows into the uterine muscle (myometrium) and can drive inflammation and pain.
It’s important to know that junctional zone thickening is not a definitive diagnosis by itself—it’s an imaging clue that needs to be interpreted alongside your symptoms (like painful periods, heavy bleeding, pelvic pain, or fertility challenges) and the rest of the MRI details. Sometimes thickening can be more pronounced in one area (suggesting focal adenomyosis/adenomyoma), and adenomyosis can also overlap with endometriosis, which can change the overall plan.
If your report mentions junctional zone thickening, our team can help you translate the exact wording into what it likely means for you—whether it supports adenomyosis, whether the pattern looks focal or diffuse, and what next steps make sense based on your goals (symptom relief, fertility, or both). Reach out to schedule a consultation so we can review your imaging and history together.
What does “heterogeneous myometrium” mean on imaging?
A “heterogeneous myometrium” means the uterine muscle (the myometrium) looks uneven in texture on ultrasound or MRI instead of smooth and uniform. It’s a descriptive imaging term—not a diagnosis by itself—and it tells us there may be changes within the uterine wall that deserve a closer look.
One common reason this shows up is adenomyosis, where endometrial-like tissue grows into the uterine muscle and can create a patchy, mixed-appearance pattern (sometimes focal, sometimes more diffuse). Depending on the rest of the report, radiologists may also comment on related features such as junctional zone irregularity on MRI or other signs that increase (or decrease) confidence for adenomyosis.
If your report feels vague, that’s not uncommon—imaging can suggest adenomyosis but can’t always confirm it with certainty. Our team can review your symptoms alongside the details of your imaging (and, when needed, recommend the right next diagnostic step) to clarify what this finding likely means for your pain, bleeding, or fertility goals.
Can adenomyosis cause chemical pregnancies?
Adenomyosis can be associated with fertility challenges, and for some patients it may contribute to very early pregnancy loss (often called a chemical pregnancy). While we can’t say adenomyosis is the only—or even the most common—cause of a chemical pregnancy, it can change the uterine environment in ways that may interfere with implantation and early embryo development, including increased inflammation within the uterine muscle and altered uterine contractions.
It’s also common for adenomyosis to overlap with endometriosis, and that overlap can add additional factors that may affect implantation and early pregnancy. If you’re experiencing recurrent chemical pregnancies—especially alongside heavy bleeding, painful periods, or pelvic pain—our team can help you evaluate whether adenomyosis (and/or endometriosis) may be part of the picture and what uterus-sparing options might make sense for your goals. You can explore more on our site or reach out to schedule a consultation so we can review your history and imaging and map out next steps.
Can heavy bleeding cause lightheadedness or fainting?
Yes. Heavy menstrual bleeding can make you feel lightheaded, dizzy, weak, or even faint—most commonly because ongoing blood loss can lead to iron deficiency and anemia, which reduces oxygen delivery to your tissues. Some people also feel faint from a combination of pain, dehydration, and low blood pressure during a heavy, crampy period.
If you’re soaking through protection quickly, passing large clots, bleeding for many days, or noticing new fatigue, shortness of breath, heart racing, or near-fainting, we take that seriously—especially when heavy bleeding may be coming from adenomyosis, fibroids, or endometriosis-related bleeding patterns. Our team can help you connect the bleeding to the full picture, confirm whether anemia or another issue is driving your symptoms, and build a plan that addresses both the bleeding and the underlying cause. If you’re ready, reach out to schedule a consultation so we can evaluate what’s going on and discuss your options.
Can adenomyosis cause headaches or migraines?
Yes—adenomyosis can be associated with headaches or migraines for some patients, especially when symptoms flare around the menstrual cycle. Adenomyosis is hormonally responsive and can drive inflammation and pain signaling in the body, and that whole-body inflammatory “load” can overlap with migraine biology in susceptible people.
That said, headaches aren’t considered a classic hallmark symptom the way heavy bleeding, severe cramping, and an enlarged/tender uterus are. When headaches are prominent, we also look at common overlap scenarios—like adenomyosis coexisting with endometriosis—and whether the timing tracks with bleeding, cramping, or hormonal shifts.
If your headaches reliably worsen with your cycle or improve when pelvic symptoms are better controlled, that pattern can be an important clue. Our team can help you connect the dots between uterine disease, cycle patterns, and your broader symptom picture, and then discuss treatment pathways that fit your goals—whether that’s targeted medical therapy, minimally invasive surgery when appropriate, and supportive strategies that are coordinated as part of one plan.

