Endometriosis And Preeclampsia What You Should Know

If you’re living with endometriosis or adenomyosis and thinking about pregnancy (or you’re already pregnant), it’s normal to worry about complications—especially ones that can feel sudden and scary, like preeclampsia. You might also be carrying the added stress of past dismissal: “endometriosis is just pain,” “adenomyosis is no big deal,” or “pregnancy will fix it.” It's important to look at more actionable information than that; this is not new but is information that no one seems to be talking about much.

Recent evidence suggests the story is more nuanced: endometriosis severity might matter a little, but adenomyosis and severe period pain (dysmenorrhea) may matter more when it comes to preeclampsia risk in some groups of patients. This doesn’t mean you’re destined for complications. It does mean you may benefit from a more intentional conversation with your obstetric team early on—so you can be monitored appropriately.

First, what is preeclampsia (and why does it matter)?

Preeclampsia is a pregnancy complication involving high blood pressure and signs that organs (often kidneys or liver) may be under stress, typically after 20 weeks. It can range from mild to severe, and when it’s not recognized early it can become dangerous for you and the baby.

What you can do with this information: if you’re at higher risk, the goal is to catch it early and to use any proven prevention/monitoring strategies your clinician recommends.

Does endometriosis raise preeclampsia risk?

Here’s the most practical way to interpret the newest evidence:

• If you have milder endometriosis (ASRM stage I–II), the genetic analysis in this research did not show a clear link with preeclampsia/eclampsia.
• If you have more severe endometriosis (ASRM stage III–IV) or possibly deep infiltrating endometriosis, there may be some relationship with preeclampsia/eclampsia risk—but the estimated effect size was extremely small (the odds ratios were very close to 1.0). In real life, that means: this is not a “high risk because you have endometriosis” headline.

Just as important: when researchers looked at a real-world group of people with surgically confirmed endometriosis who later delivered, the apparent link between “more surgical severity” and preeclampsia got much weaker once other factors were considered—especially adenomyosis and dysmenorrhea.

Bottom line: Endometriosis severity alone doesn’t look like a strong, standalone predictor of preeclampsia in this dataset—especially once adenomyosis enters the picture.

Adenomyosis may be the bigger flag to bring up

If you’ve been diagnosed with adenomyosis, which can stand alone or be associated with endometriosis, or if you suspect it because of symptoms (heavy bleeding, enlarged tender uterus, “bulky” uterus on ultrasound, deep aching cramps), this evidence gives you a concrete reason to mention it in pregnancy care planning.

In the observational cohort analysis, adenomyosis had the strongest association with preeclampsia (odds ratio about 10). This means ten times the risk compared to someone without adenomyosis. That number is striking, but it needs careful framing:

• It’s an association in one retrospective cohort—not proof that adenomyosis causes preeclampsia.
• The size of the association could be influenced by how diagnosis was made, and other unmeasured factors (keep in mind that non-surgical diagnosis of adenomyosis is very difficult and usually it is based on imaging suggesting that adenomyosis is present).
• Still, it’s a powerful “signal” that adenomyosis might identify a subgroup that deserves closer blood-pressure and symptom surveillance.

If you only take one action from this post: make sure your OB/midwife knows if you have adenomyosis (diagnosed or strongly suspected), not just endometriosis.

Painful periods (dysmenorrhea) isn’t “just pain” in pregnancy planning

Many of us are conditioned to minimize period pain because we’ve been told it’s normal. But in the same cohort analysis, a history of dysmenorrhea was linked with higher odds of preeclampsia (odds ratio about 2.7).

This does not mean painful periods “cause” preeclampsia. It may mean painful periods can be a marker for a particular uterine/placental environment or co-existing conditions (like adenomyosis) that matter during pregnancy.

From an advocacy standpoint, this is validating: your symptom history belongs in risk assessment, not just your surgical reports.

How long before this affects your care?

This matters most in two windows:

Before pregnancy (or early pregnancy):

• You can ensure your care team has your full history: endometriosis stage (if known), deep disease, surgeries, adenomyosis diagnosis, typical pain severity, and any prior blood pressure issues.
• Your clinician can decide whether you meet criteria for preventive steps (for example, some patients at higher risk are advised to take low-dose aspirin starting in early pregnancy—this is individualized and not something to start on your own).

After 20 weeks:

• This is when preeclampsia usually becomes detectable. If you’re higher risk, you may benefit from more structured blood pressure monitoring and clear instructions on what symptoms should trigger a call or evaluation.

Who should take this most seriously?

You may want a more proactive pregnancy plan if any of the following apply:

• You’ve been told you have ASRM stage III–IV endometriosis or deep infiltrating endometriosis
• You have a diagnosis (or strong suspicion) of adenomyosis
• You’ve had severe dysmenorrhea, especially if it came with heavy bleeding or “uterus feels bruised” pelvic pain
• You’re older (in this cohort, age tracked with higher odds, OR about 1.2 per increment used in their model)

This is not about labeling you “high risk” automatically. It’s about ensuring your team doesn’t miss relevant context. This may influence decisions about home birth, for example.

Practical takeaways for your next appointment

Use the visit to shift from vague worry (“Am I higher risk?”) to concrete planning. Bring any operative notes, MRI/ultrasound reports, and your symptom summary.

Questions to ask your OB/midwife (or MFM specialist):

• “Given my endometriosis history and possible/confirmed adenomyosis, how should we monitor my blood pressure and symptoms during pregnancy?”
• “Do I meet criteria for low-dose aspirin to reduce preeclampsia risk? If yes, when should I start, and what dose?”
• “Should I do home blood pressure monitoring? If yes, what numbers mean I should call you or go in?”
• “Are there any additional growth scans or placental checks you recommend because of my history?”
• “If I get headaches, visual changes, right upper belly pain, sudden swelling, or shortness of breath—what’s the exact plan for urgent evaluation?”

Reality check: what this research can’t promise

This evidence can help you advocate for attention, but it can’t predict your individual outcome.

• The genetic signal linking advanced/deep endometriosis to preeclampsia/eclampsia was not consistent across all analyses and the effect estimates were tiny, so it’s not a strong “cause and effect” answer.
• The large association seen with adenomyosis came from a single retrospective cohort of people with surgically confirmed endometriosis, so it may not translate perfectly to everyone with adenomyosis in the general population.
• Many known preeclampsia risk factors (like chronic hypertension, kidney disease, autoimmune disease, prior preeclampsia, multifetal pregnancy) still matter a lot and should be considered alongside endometriosis/adenomyosis history.

What is clear: you should get pregnancy care that takes your pelvic pain history seriously—and asking about preeclampsia monitoring is important. Depending upon who your clinician is and how well versed they are about advanced endo or adenomyosis, it may not be on the radar unless you raise the question.