The endocannabinoid system may offer new approaches to managing endometriosis pain | Research

The takeaway

A review of the complex pain mechanisms in endometriosis identified the endocannabinoid system as a relevant pharmacological target, given its involvement in multiple pain pathways affected by the condition.

Read this if you want to understand the scientific rationale for using cannabinoids to manage endometriosis pain.

The endocannabinoid system intersects with inflammatory, neuropathic, and central sensitization pathways in endometriosis

What the researchers found

Endometriosis causes diffuse and poorly localized severe pain that is often inadequately managed by current medical, hormonal, and surgical approaches. The review described how endometriosis involves multiple overlapping pain mechanisms: inflammatory, neuropathic, and central sensitization.

The endocannabinoid system (ECS) intersects with several of these pain pathways. The review presented current data and theories about how modulating the ECS could target different aspects of endometriosis-associated pain, including the inflammatory component, nerve growth into endometrial lesions, and altered pain processing in the central nervous system.

Why it matters

Endometriosis affects roughly 10% of reproductive-age women and current pain management often fails. The endocannabinoid system represents a biologically plausible new target because it is involved in pain modulation, inflammation, and immune regulation, all of which are disrupted in endometriosis.

The numbers in context

Endometriosis affects an estimated 10% of reproductive-age women. Current medical management has high recurrence rates. The review identified the ECS as relevant to inflammatory, neuropathic, and central sensitization pain mechanisms in endometriosis.

How the study worked

Computerized literature search combining keywords "endometriosis," "endocannabinoid," "cannabinoid receptor," "THC," and "pain mechanisms." The review synthesized findings on pain mechanisms in endometriosis and evidence for ECS involvement.

What this study cannot tell us

This is a narrative review without systematic methodology. The evidence linking the ECS to endometriosis pain is largely theoretical and based on preclinical data. No clinical trials of cannabinoid treatments for endometriosis were included. The review does not address potential risks of cannabinoid use.

How to read the evidence

Narrative review presenting theoretical rationale and preclinical evidence. No clinical trial data on cannabinoids for endometriosis was available.

When this study was published

Published in 2017. Clinical research on cannabinoids for endometriosis has since begun, with several studies exploring patient-reported outcomes.

The bigger picture

The intersection of the endocannabinoid system with multiple endometriosis pain pathways explains why some patients report symptom relief from cannabis, even though no controlled clinical trials had been conducted at the time of this review. Understanding which specific pain mechanisms the ECS targets could guide the development of more precise cannabinoid-based therapies.

Questions still open

Would THC, CBD, or other cannabinoids be most effective for endometriosis pain? Could endocannabinoid-modulating drugs reduce the need for surgical intervention? Is the endocannabinoid system actually dysregulated in endometriosis tissue?

Common questions

Can cannabis treat endometriosis pain?

The review provides a theoretical basis for why cannabinoids might help, given the endocannabinoid system's involvement in the pain pathways affected by endometriosis. However, no controlled clinical trials existed at the time of publication. Anecdotal reports from patients are encouraging but not yet supported by rigorous evidence.

Why is endometriosis pain so hard to treat?

Endometriosis pain involves multiple overlapping mechanisms including inflammation, nerve growth into lesions, and changes in how the central nervous system processes pain. Current treatments often address only one mechanism, which may explain why they frequently fail.

Read the original research

The Clinical Significance of Endocannabinoids in Endometriosis Pain Management.

Cannabis and cannabinoid research, 2(1), 72-80

View on PubMed ↗Publisher’s paper ↗

Citation

Bouaziz, Jerome; Bar On, Alexandra; Seidman, Daniel S; Soriano, David. (2017). The Clinical Significance of Endocannabinoids in Endometriosis Pain Management.. Cannabis and cannabinoid research, 2(1), 72-80. https://doi.org/10.1089/can.2016.0035