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Why Endometriosis and Fibroids Often Show Up Together—And What That Means for You

How having both conditions can change your symptoms, your diagnosis, and your treatment plan

By Dr Steven Vasilev
Abstract flat vector illustration of intertwining organic shapes symbolizing the link between endometriosis and fibroids, using bold teal and coral colors.

Living with endometriosis is never straightforward. Between the pain, the heavy periods, and the frustration of waiting for diagnosis or relief, you may already feel overloaded. But what if your symptoms could be caused by something else on top of endometriosis—something like uterine fibroids? You’re not alone in thinking it’s unfair, or even impossible, to have both. Yet, new evidence points to an unfortunate yet important truth: if you have endometriosis, you’re much more likely to also have uterine fibroids compared to other women.


Understanding this link could change how you—and your doctor—approach your care. Let’s look at what this means for your symptoms, your diagnosis, and the way forward.



Why Does It Matter If You Have Both Endometriosis and Fibroids?


Both endometriosis and uterine fibroids can significantly affect quality of life, particularly around the menstrual cycle. Because these conditions share many features, their symptoms often overlap, making it difficult to tell one from the other. Common issues include heavy or prolonged menstrual bleeding, painful periods, pelvic pressure or bloating, pain during intercourse, and difficulties with getting or maintaining a pregnancy.


If you’re suspicious that something else is behind your never-ending cramps or sudden changes in your bleeding patterns, knowing about this increased risk can help you get the answers—and treatment—you deserve.


How Common Is It to Have Both?


Recent research tells us that women with endometriosis are about three times more likely to have fibroids than women without endometriosis. To put it simply: if you have endometriosis, your chances of also having fibroids are significantly higher than you might expect.


That risk can be even greater. When researchers looked specifically at women with endometriosis compared to women who have no gynecological symptoms at all, they found women with endometriosis had up to seven times the odds of having fibroids.


Symptoms: When Should You Suspect Fibroids, Too?


It’s easy to dismiss new or changing symptoms as “just my endo," or the other way around in some cases in case you already know you have fibroids. But because endometriosis and fibroids often show up together, especially if you have a higher body mass index (BMI) or have had children, it’s important to pay attention if your symptoms change or worsen.


Some key changes can signal fibroids as well:

  • Sudden increase in heavy or prolonged bleeding
  • Worsening pelvic pressure or visible abdominal swelling
  • Frequent urination or constipation, especially if you didn’t have those issues before
  • Sudden changes in pain pattern


Not everyone will notice a dramatic shift. In fact, many women with both conditions end up undiagnosed or dismissed for years. If things feel different, advocate for yourself. Ask your healthcare provider: “Could I have fibroids, too?”


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Why Does This Happen? (And What Can You Do About It?)


Doctors aren’t entirely sure why endometriosis and fibroids so often go hand-in-hand. Both conditions depend on estrogen, but the exact overlap isn’t clear. Just like endometriosis, it is probably polygenic and multifactorial in the final analysis and we will eventually unravel that code. What the recent research does tell us, though, is that certain factors—like having a higher BMI—do make it more likely you’ll have both conditions.


Managing your BMI (aiming for a healthy weight) may help decrease your risk of developing fibroids. While you can’t control every risk factor, small steps toward a healthy lifestyle can make a difference, not just for your gynecological health but for your overall wellbeing.


How Does This Change Your Treatment Options?


If you have both endometriosis and fibroids, treatment can be more complicated—but also more tailored to your needs. Some approaches, like hormonal medications, may help both conditions. Others, like surgical removal of fibroids, might be necessary if symptoms are severe or impacting your fertility.


It’s crucial your doctor takes the possibility of both conditions into account when:

  • Evaluating unexplained pelvic pain or heavy bleeding
  • Discussing fertility treatments
  • Planning surgery (to avoid missing hidden problems); compared to endo excision, myomectomies can be easier and demand a lesser skill set unless they are large or of certain configuration. With both, the required skill set is likely going to have to be at a higher level.
  • Considering hormonal therapies

Missing one diagnosis can mean missing out on the most effective relief. That’s why awareness—yours and your doctor’s—matters.


Practical Takeaways: What to Ask and Watch For


Next time you’re talking with your healthcare provider—or even just tracking your symptoms—keep these points top of mind:

  • Could my symptoms be caused by both endometriosis and fibroids?
  • Should I have an ultrasound or MRI to check for fibroids if my bleeding or pain is getting worse?
  • How might having both conditions influence my treatment options or fertility planning?
  • What lifestyle changes could help lower my risk, especially regarding BMI?
  • Are there warning signs I should watch for, like sudden rapid growth of my abdomen, severe changes in bleeding, or unmanageable pain?


The Practical Overview


Here’s what we don’t know yet: Having endometriosis doesn’t mean you’re guaranteed to get fibroids, or that you’ll suffer more. Odds ratios and risk numbers can’t predict what will happen to you as an individual. Some women with both conditions manage well with medication and self-care, while others may need more involved treatments.


And while recognizing the link between these conditions is crucial, don’t let statistics cause unnecessary anxiety—use this information to give yourself another tool for advocating for your health.


Other options like MRI, seeking a second opinion, or making lifestyle adjustments remain important if the answers you’re getting don’t add up with the way you feel.

References

  1. Fiore A, Casalechi M, Sichenze L, Ferraro C, Magni B, Bellinghieri R, Vercellini P, Somigliana E, Viganò P, Salmeri N. Co-occurrence of endometriosis and uterine fibroids: a systematic review and meta-analysis. EClinicalMedicine. 2025 Sep 19;89:103510.. DOI: 10.1016/j.eclinm.2025.103510

Quick Answers

When is menstrual bleeding considered too heavy?

Menstrual flow is generally “too heavy” when it consistently disrupts your life or overwhelms your usual period products—think flooding or soaking through pads/tampons quickly, passing frequent or large clots, needing to double up, or bleeding long enough that you can’t plan around it. Another major clue is fatigue, dizziness, or shortness of breath that can come with iron deficiency from ongoing blood loss. If you’re timing your day around bathrooms, waking at night to change products, or avoiding work, exercise, travel, or sex because of bleeding, that’s not something we consider “normal.”


Heavy bleeding is a symptom, not a diagnosis, and common underlying drivers include adenomyosis, fibroids, hormonal imbalance, and sometimes endometriosis—especially when heavy bleeding shows up with severe cramps or deep pelvic pain. Because imaging and symptoms don’t always match (a scan can look “mild” while symptoms are intense), we take a symptom-led approach and look at the full pattern, including pain, pressure, clots, cycle timing, and any signs of anemia. If your bleeding feels like it’s escalating or you’ve been told to “just live with it,” our team can help you sort out likely causes and build a plan that targets the source—not just the bleeding.

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Can endometriosis cause arthritis-like joint pain?

Yes—endometriosis can be associated with arthritis-like joint pain in some people, even though joint pain isn’t considered a classic “core” symptom. Endometriosis can drive chronic inflammation and immune dysregulation, and that whole-body inflammatory state may show up as aching, stiffness, or flares that feel similar to inflammatory arthritis. Some patients also notice joint symptoms that cycle with their period or worsen during broader endometriosis flares.


At the same time, endometriosis doesn’t “equal” autoimmune arthritis, and an association doesn’t prove that one causes the other. Research suggests higher rates of certain autoimmune conditions in people with endometriosis—including inflammatory diseases that can affect joints—so persistent joint pain deserves a full-picture evaluation rather than being automatically attributed to pelvic disease alone. If you’re dealing with pelvic pain plus joint symptoms, our team can help you sort out what fits endometriosis, what may be a related immune condition, and how that affects your treatment plan, including whether excision surgery and coordinated integrative support make sense for you.

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What does advanced adenomyosis mean?

“Advanced adenomyosis” usually means the adenomyosis is more extensive within the uterine muscle—often involving a larger area (diffuse disease), deeper penetration into the myometrium, and/or more pronounced changes like uterine enlargement and tenderness. It’s not the same as “advanced endometriosis,” because adenomyosis doesn’t spread outside the uterus; “advanced” is more about how much of the uterine wall appears affected and how significantly it’s impacting symptoms.


Because adenomyosis doesn’t have a single universally accepted staging system, different clinicians and radiology reports may use “advanced” to summarize imaging features (ultrasound or MRI) and the overall clinical picture—such as heavy bleeding, severe period pain, pelvic pressure, or fertility challenges. In our practice, we focus less on the label and more on what your imaging suggests (diffuse vs focal/adenomyoma, junctional zone changes, uterine size) and what your goals are (pain control, bleeding control, fertility preservation, or definitive treatment). If you’ve been told you have “advanced adenomyosis,” our team can help you interpret what that means in your specific case and map out next steps.

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How long do endometriosis flare-ups last?

Endometriosis flare-ups don’t have one “usual” length—some people feel a spike in symptoms for a few hours to a couple of days, while others have flares that stretch across an entire cycle window or blend into more constant pain. Many flares track with hormonal shifts (often before and during a period), but bowel, bladder, pelvic floor, or nerve-related pain can flare at different times and may not follow a neat calendar pattern.


When flares start lasting longer or happening more often, it can be a sign that multiple pain drivers are stacking—ongoing inflammation from lesions, adhesions/fibrosis that can “tether” organs, and sometimes central sensitization, where the nervous system becomes more reactive over time. That’s why symptom management alone can feel like a band-aid if active disease is still present. If you’re noticing prolonged, unpredictable, or escalating flares, our team can help you map your pattern, identify what’s likely driving it, and discuss a plan that addresses both symptom control and the underlying endometriosis.

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Can endometriosis cause large menstrual blood clots?

Yes—endometriosis can be associated with heavier menstrual bleeding for some people, and heavier flow can come with larger clots. That said, large clots aren’t specific to endometriosis, because clotting is often a sign that bleeding is heavy enough that the body can’t “keep up” with breaking it down as it leaves the uterus.


When we hear about large clots, we also think about conditions that more directly drive heavy/prolonged uterine bleeding, especially adenomyosis and fibroids—which frequently overlap with endometriosis and can be missed if the focus stays only on pelvic pain. If you’re noticing new or worsening clotting (especially alongside severe period pain, pressure/bloating, or fatigue), our team can help you sort out whether endometriosis is part of the picture, whether there’s a uterine source of bleeding, or whether both are contributing. If you’d like, you can reach out to schedule a consultation so we can review your symptom pattern, prior imaging, and the next best steps for a clear diagnosis and durable relief.

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Have a question?

Dr. Steven Vasilev delivers best-in-class endometriosis guidance and a personalized treatment plan—built on evidence and your unique biology.


Led by Steven Vasilev, MD—an internationally recognized endometriosis specialist & MIGS surgeon—Lotus Endometriosis Institute is virtual-forward, with many patients traveling nationally for care. Clinical evaluation and surgical treatment are provided in California.

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