Stages & Progression

The AAGL endometriosis classification system is a standardized way surgeons describe what they found at surgery—where endometriosis is located, how extensive it is, and how complex the disease appears. Its goal is to create a more consistent “shared language” than older staging alone, especially for cases where symptoms and imaging don’t tell the full story.

Unlike simple stage labels, AAGL-style classification is meant to better capture real-world surgical complexity, including deeper disease that can involve structures like the uterosacral ligaments, rectovaginal space, bowel, bladder, or ureters. This matters because location and depth (for example, deep infiltrating disease) can drive very different symptoms and may change imaging choices and surgical planning. If you’re reading an operative report or trying to make sense of what a surgeon told you, our team can help translate the classification into what it likely means for your body, your symptoms, and the treatment path you’re considering.

Endometriosis doesn’t grow at one predictable “rate.” It’s a heterogeneous condition—meaning different subtypes and lesion types can behave very differently—so one person may have slow, relatively stable disease while another has more biologically aggressive, invasive lesions that progress faster. Growth is influenced by where it is (surface vs deeper tissues or organs), the local inflammatory environment, and hormone signaling (including local estrogen activity and reduced progesterone response).

What most people notice first isn’t literal growth you can feel happening day-to-day, but changing symptoms over months or years—new bowel or bladder symptoms, worsening pain, or the appearance/enlargement of an endometrioma on imaging. It’s also why “stage” doesn’t reliably predict pain, and why a normal exam (or even normal imaging) doesn’t rule out active disease, especially with deep infiltrating endometriosis. If you’re trying to understand whether your symptoms suggest progression, our team can help you connect your symptom pattern with the most likely disease types and next diagnostic steps, and discuss when strategic excision surgery is appropriate.

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.