What Causes Endometriosis? Current Theories & Evidence
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Schedule an AppointmentUnderstand how endometriosis severity is staged and how it may change over time, with clear guidance on symptoms, fertility impact, monitoring, and evidence-based strategies to slow progression and tailor treatment.
Stages describe how widespread endometriosis is, not how much it hurts. The rASRM system labels stages I–IV based on implant number, size, and adhesions seen at surgery; it often underestimates deep lesions. For deep infiltrating disease, ENZIAN subtypes give a map of depth and organ involvement. Understanding stage helps anticipate surgical complexity and fertility impact, but it does not reliably predict pain severity or daily function. Imaging with targeted ultrasound or MRI can complement staging by showing where disease sits and how it may affect nearby organs.
Progression varies: some people remain stable for years, others develop adhesions, endometriomas, or deep disease. Factors like delayed diagnosis, ovarian cysts, and chronic inflammation may increase risk. Monitoring centers on symptom tracking, fertility goals, and focused reassessment with Ultrasound or MRI when decisions change. Strategies that may slow progression include continuous hormonal suppression, timely, expert Excision Surgery when indicated, and anti‑inflammatory lifestyle measures. Learn how stage informs treatment planning and fertility counseling, how progression is assessed over time, and which evidence‑based steps—from Medical Management to Anti-Inflammatory Diet and individualized planning within Fertility & Reproductive Health or Deep Infiltrating Endometriosis—can help protect quality of life and future goals.
Endometriosis “returning” after surgery can show up as symptoms that improve for a while and then gradually (or suddenly) come back months or even years later. The most common signal is the return of your familiar pattern—cyclical pelvic pain, worsening period pain, pain with intercourse, or pain that starts spreading beyond where it used to be. Some people also notice bowel or bladder symptoms re-emerge (pain with bowel movements, rectal pressure, urinary urgency or bladder pain), especially if those organs were involved before. New or increasing fatigue and activity limitation can be part of the picture, but the key is a clear change from your post-op baseline.
It’s also important to know that recurrent pain doesn’t always equal recurrent disease. Even after complete excision, the nervous system can stay “turned up,” and pelvic floor dysfunction, adhesions, or central sensitization can keep pain going or make normal sensations feel painful—so we think in terms of patterns, triggers, and timing rather than a single pain score. If symptoms are returning, our team can help you sort whether you’re in a true recurrence lane (improved, then returned) versus persistent pain that never fully settled, and decide when imaging (such as ultrasound or MRI) is useful—particularly for tracking ovarian endometriomas. If you’re noticing a shift back toward your old symptoms, reach out to schedule a consultation so we can build a clear, long-term follow-up plan with you.
Not reliably. The ASRM stages (I–IV) mainly describe what’s seen at surgery—location, amount of disease, scarring, and adhesions—not how your nervous system experiences pain. That’s why someone can have “low-stage” endometriosis with debilitating symptoms, while another person with more extensive disease reports surprisingly little pain.
Pain tends to correlate more with where lesions are, whether deeper structures are involved (like bowel, bladder, ureters, or pelvic nerves), and how much inflammation, pelvic floor guarding, and pain sensitization have developed over time. In our practice, we focus less on the stage number and more on your specific symptom pattern (period pain, pain with sex, bowel/bladder symptoms, cyclical flares, leg or diaphragmatic pain), paired with expert imaging when appropriate, to understand what’s driving your pain.
If you’ve been told your pain “shouldn’t be that bad” because of a stage label, you’re not alone—and you’re not imagining it. Exploring endometriosis subtypes, coexisting conditions (like adenomyosis), and pain mechanisms often explains the mismatch and opens the door to more targeted treatment options, including excision when indicated. If you’d like, you can reach out to schedule a consultation so our team can review your history and help map symptoms to likely sources.
Endometriosis “staging” is a surgical scoring system (most often the ASRM system) that describes what was found at laparoscopy—things like how much disease is present, where it is, and whether there are adhesions or ovarian endometriomas. It sorts findings into four stages (I–IV), from minimal to severe, based on those anatomic features. This can be helpful shorthand for documentation and planning, but it’s not a complete picture of the disease.
The most important thing to know is that stage does not reliably predict how much pain you have, how disabling your symptoms are, or even how complex your case may be. Someone can have intense symptoms with a low stage score, while another person with a higher stage may have less pain. That’s because symptoms often depend on where endometriosis is and how it behaves—especially with subtypes like deep infiltrating disease (which can involve structures such as the bowel, bladder, ureters, and pelvic ligaments) that aren’t always captured well by a single staging number.
In our practice, we look beyond stage and focus on mapping disease location, identifying subtypes, and understanding your full symptom pattern and goals (pain relief, fertility, organ function, recurrence risk). If you’ve been told a stage and it doesn’t seem to “match” what you’re experiencing, that doesn’t mean your symptoms are any less real—it usually means the staging label is incomplete. You can explore our educational resources or reach out to schedule a consultation so our team can help interpret what your stage means in the context of your specific anatomy and symptoms.
Endometriosis can recur as early as a few months after surgery, but for many patients it’s more likely to show up over years rather than weeks. The timing varies because “recurrence” can mean different things—new or returning symptoms, a lesion seen on imaging, or a cyst such as an ovarian endometrioma coming back.
What most often determines how soon it returns is whether any disease was left behind (including microscopic or visually hidden implants), along with factors like disease severity, where it was located, whether endometriomas were involved, and whether adenomyosis is also present. It’s also important to know that pain can flare even when lesions were thoroughly removed, because the nervous system and pelvic floor can stay sensitized after years of inflammation.
Our approach is to treat surgery as a major turning point—not the finish line—by focusing on complete excision and a clear long-term plan for follow-up and symptom tracking. If you’re noticing symptoms returning after surgery (or you’re planning surgery and want to understand your recurrence risk), reach out to schedule a consultation so our team can review your history and tailor a strategy for durable relief.
Breastfeeding can temporarily quiet endometriosis activity for some people because it often suppresses ovulation and keeps estrogen levels lower—similar to other forms of hormonal suppression. That can mean fewer symptoms while you’re lactating, and it may delay the return of cycles and cycle-driven pain. However, it doesn’t remove endometriosis lesions, and it doesn’t “heal” the underlying disease environment, so recurrence can still happen once normal cycling resumes.
When we talk about recurrence, it’s also important to separate symptom control from disease control. Symptoms can improve during lactation even if residual or microscopic endometriosis is still present, and symptoms can return later for reasons that include incomplete excision, ongoing inflammation, or coexisting adenomyosis. If you’re postpartum and noticing pain returning, our team can help you sort out what’s most likely driving it and discuss a long-term plan—whether that’s careful follow-up, targeted suppression, and/or considering expert excision when the timing is right for you.
Endometriosis “stage 1–4” is a surgical classification (most commonly the ASRM/rASRM system) assigned based on what was seen during your operation—things like how many lesions there were, where they were, whether an ovary had an endometrioma, and how much scar tissue/adhesions were present. In general, stage 1 is minimal, stage 2 mild, stage 3 moderate (often including ovarian involvement and more adhesions), and stage 4 severe (more extensive disease and/or significant adhesions that can distort anatomy).
What’s most important to know is that stage does not reliably predict how much pain you should have (or how “real” your symptoms are). Some people with stage 1 have debilitating pain, and some with stage 4 have relatively little pain—because symptoms depend on disease subtype (superficial vs deep infiltrating vs endometriomas), exact locations (bladder, ureters, bowel, pelvic nerves), and coexisting conditions like adenomyosis.
After surgery, we focus less on the single stage number and more on the operative findings that affect your plan: what type of endometriosis you had, whether deep disease was present, which organs were involved, and how completely it could be safely excised. If you’d like, our team can walk you through your photos/pathology and explain what your staging means for recovery, symptom expectations, and long-term strategy.
Not everyone needs birth control after excision to prevent recurrence, and it isn’t the same as a “must-do” rule. Excision removes existing endometriosis, but it doesn’t change the underlying hormone-influenced, inflammatory environment that can allow new or residual microscopic disease to become active over time—especially if you still have your ovaries and are cycling. Hormonal suppression (including certain forms of birth control) can reduce symptoms and may lower recurrence risk for some patients, but it generally suppresses rather than heals the disease, and symptoms often return when it’s stopped.
Whether birth control makes sense after surgery depends on your goals (pain control vs trying to conceive), what we found and removed (superficial vs deep disease, endometriomas, bowel/bladder involvement), whether adenomyosis is also present, and how your body tolerates hormones. In our practice, we treat post-op care as a long-term plan—pairing meticulous excision with individualized follow-up and, when appropriate, medical suppression—to help you maintain relief for years, not just weeks. If you’re unsure what’s right for you, reach out to our team so we can review your surgical findings, symptoms, and priorities and map out a recurrence-prevention plan that fits.
Yes. Pain severity doesn’t reliably track with endometriosis “stage,” location, or biological activity—some people have extensive disease with surprisingly little pain, while others have severe pain with a smaller disease burden. Symptoms can improve for many reasons (hormonal suppression, changes in inflammation, shifts in nerve sensitivity, pelvic floor changes, or central sensitization), without necessarily meaning the lesions, adhesions, or organ involvement have stopped progressing.
Because endometriosis can affect delicate structures like the bowel, bladder, ureters, and deeper pelvic tissues, we focus on the full pattern—not just how painful your periods are this month. If your pain is improving but you’re noticing red-flag changes like worsening bowel/bladder function, increasing fatigue, fertility challenges, pain with sex, or a growing ovarian cyst/endometrioma on imaging, it’s worth taking a closer look.
Our team approaches this by listening carefully to your history and flare pattern, then tailoring evaluation with expert imaging when helpful and considering coexisting drivers that can mask or amplify pain. If you’re unsure what your improvement “means,” reach out—our goal is to clarify what’s actually happening and map out the next best step for lasting relief and long-term protection of your pelvic health.
Learn what causes endometriosis, how it grows, diagnosis options, current treatments, and holistic strategies to reduce symptoms and recurrence.
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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154 Traffic Way, Arroyo Grande, CA 93420