A free self-assessment guide to understanding the three types of endometriosis pain — and why knowing the difference changes everything about your treatment.
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If you have endometriosis, you've probably been told your pain comes from the lesions — the implants growing where they shouldn't be. And that's partly true. But it's not the whole story. For most women with endo, it's not even the biggest part of the story.
Here's what most providers don't explain: endometriosis creates three distinct types of pain, and each one requires a completely different treatment approach.
The first type — the pain directly from lesions and inflammation — is what surgery and hormonal therapy are designed to treat. And for some women, that's enough. If your pain tracks with your cycle, stays mostly in your pelvis, and responds to NSAIDs or hormonal therapy, that's a good sign that lesion-related pain is your primary driver.
But for the majority of endo patients, something else is also happening. Pain that spreads beyond the pelvis. Pain that doesn't follow your cycle anymore. Fatigue, brain fog, sensitivity to light or touch. Pain that persists even after technically successful treatment. These aren't signs that your treatment failed or that something is wrong with you — they're signs of additional pain mechanisms that need to be addressed differently.
Roughly 41% of endometriosis patients show features of central sensitization — meaning their nervous system has changed how it processes pain signals. And many have nerve involvement that standard treatments don't address at all.
Understanding which types of pain are active in YOUR body is the single most important thing you can do for your treatment plan right now. That's what this page is for — and below you'll find the full, validated Central Sensitization Inventory (CSI-25) alongside a neuropathic pain screen. It takes about 5 minutes and gives you a clinically meaningful score you can bring to your provider.
Most patients and many providers think of endo pain as one thing. It's not. Research published in JAMA (2025), The Lancet (2021), and Pain (2022) shows that endometriosis creates three distinct pain mechanisms — and most patients have more than one happening simultaneously. Here's what each one is, how to recognize it, and why it matters.
Lesion & Tissue-Related
This is the pain that comes directly from endometriosis lesions — implants causing inflammation, tissue damage, and irritation in the pelvis. It's the type of pain most people (and most providers) think of when they think of endo. It's also the type that surgery and hormonal therapy are specifically designed to treat.
Excision surgery, hormonal therapy, and anti-inflammatory approaches. This is the pain type that conventional endometriosis care is built around — and for patients whose pain is predominantly nociceptive, these treatments often work well. If this description fits you and your current treatment is working, that's great. Keep going.
The key question: Does this description fully explain your pain? Or do you also experience symptoms that don't fit this pattern — pain that has spread, doesn't follow your cycle, or didn't resolve with treatment? If so, keep reading.
Nerve Involvement
This pain occurs when endometriosis lesions invade, compress, or irritate nerves — or when chronic inflammation causes the nerves themselves to become sensitized. Standard pain medications and hormonal therapy often don't touch neuropathic pain because the problem isn't inflammation — it's the nerve itself.
Neuromodulatory medications (gabapentin, pregabalin, duloxetine, amitriptyline), nerve blocks, pelvic floor physical therapy, and in some cases interventional pain management. These are completely different from the medications typically prescribed for endometriosis.
Central Sensitization
This is the pain type that explains the most confusing and isolating part of endometriosis: when your pain doesn't match your disease. Nociplastic pain (also called centralized pain) happens when months or years of pain signals cause your brain and spinal cord to become hypersensitive. The nervous system essentially "learns" to amplify pain — and continues producing pain signals even after the original tissue damage is treated.
This is not psychological. It involves measurable structural and chemical changes in the brain, spinal cord, and immune system. Brain imaging studies show reduced gray matter in pain-processing regions. Spinal cord studies show hyperexcitable neurons. Immune cells in the central nervous system (microglia and astrocytes) become chronically activated.
A multimodal approach: pelvic floor physical therapy, pain neuroscience education, cognitive behavioral therapy or pain reprocessing therapy, neuromodulatory medications (duloxetine, low-dose naltrexone), nervous system regulation work, and addressing sleep, stress, and movement. This type of pain requires treating the brain and spinal cord, not just the pelvis.
The reality for most patients: Pure nociceptive, neuropathic, or nociplastic pain is rare. Most endometriosis patients have mixed pain — two or three of these mechanisms happening simultaneously. That's why a treatment that only targets one type (like surgery alone, or hormonal therapy alone) often falls short. The treatment plan has to match YOUR specific combination.
The questions below are drawn from two validated clinical tools: the Central Sensitization Inventory (CSI) — the full 25-item version — and the DN4 Neuropathic Pain Questionnaire. These are the same tools used in pain research published in JAMA, The Lancet, and Pain.
The CSI was developed by Mayer et al. (2012) and has been validated across multiple populations with a clinically established cutoff of ≥40 out of 100 (78% sensitivity, 80% specificity for central sensitization). This assessment gives you a clinically meaningful picture of which pain mechanisms may be active in your body — the same scoring your provider would use. It is not a diagnosis, but it can fundamentally change the conversation about your treatment plan.
Most endometriosis treatment follows a one-size-fits-all path: try hormonal therapy, and if that fails, have surgery. If surgery fails, try more hormonal therapy. If that fails, consider hysterectomy.
But this approach only makes sense if all endo pain is the same type. It's not.
When you know which pain mechanisms are active in your body, the entire treatment conversation changes:
If your pain is predominantly nociceptive — surgery and hormonal therapy are likely to be effective, and you can feel confident pursuing those options.
If you have significant neuropathic features — you may need neuromodulatory medications that specifically target nerve pain, rather than more hormonal therapy or repeat surgery.
If central sensitization is a factor — you need a multimodal approach that retrains your nervous system, not just another procedure that targets the pelvis. Research shows that patients with CSI scores ≥40 who go into surgery without addressing central sensitization are significantly more likely to have persistent pain afterward.
For most patients — who have mixed pain — the treatment plan needs to address multiple mechanisms simultaneously. Some patients need surgery AND nervous system work. Most need both — but knowing what you're dealing with determines the right sequence, the right providers, and the right expectations.
This is the part that often gets missed — not because providers don't care, but because most endo care was built around one pain type. Understanding what you're actually dealing with is the first step toward a plan that matches your full experience.
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I'm Heather Yoshimura, NP — a UCSF-trained nurse practitioner who specializes in comprehensive endometriosis care.
I'm also an endo patient. I had two excision surgeries — the second with one of the top excision surgeons in the world. I spent over $125,000 on treatment. And I was still in pain.
What changed everything for me wasn't another surgery. It was understanding that my pain had become centralized — my nervous system had learned to amplify pain signals beyond what the lesions were causing. When I finally addressed the nervous system alongside the disease, things shifted.
I built this resource because I wish someone had explained this to me ten years ago. Understanding the three types of pain would have changed every treatment decision I made.
I run Luteal Health — a telehealth practice focused on comprehensive endometriosis care. If you want to learn more about my clinical work, you can find me at luteal.health.