Cannabis for endometriosis: pain, CBD & study situation

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Most importantly, endometriosis lesions express CB1 and CB2 at lower levels than normal endometrium – an ECS hypoactivity directly at the pathology site. CBD inhibited proliferation and invasion of lesions in vitro (Bouaziz 2017).
At a glance:
  • Endometriosis lesions express CB1 and CB2 – ECS directly involved in pathophysiology
  • CBD inhibited proliferation and invasion of endometriosis lesions in vitro (Bouaziz 2017)
  • 13% of endometriosis patients use cannabis – average 7.6/10 self-reported efficacy

Endometriosis and the endocannabinoid system

Overview hide
Endometriosis and the endocannabinoid system
ECS in endometriosis: key findings
Study situation: Cannabis for endometriosis
What cannabis can help with endometriosis
Practical application: What works
GKV and endometriosis
FAQ: Cannabis for endometriosis
Summary

Endometriosis affects around 10 % of all women of childbearing age – around 2 million sufferers in Germany. The disease is characterized by ectopic endometrial tissue (outside the uterus), which bleeds monthly, causes inflammation and triggers chronic pelvic pain. The link to the endocannabinoid system (ECS) is well documented – making cannabis one of the most pharmacologically plausible options for this condition.

ECS in endometriosis: key findings

CB1 and CB2 expression in endometriosis tissue: Endometriosis lesions express CB1 and CB2 – interestingly at lower levels than normal endometrium. This ECS hypoactivity in endometriosis tissue could explain why exogenous cannabinoids have a therapeutic effect (compensation of the deficit).

Anandamide and endometriosis: Obstetric women with endometriosis have lowered anandamide levels in the peritoneal fluid. Anandamide normally inhibits endometrial cell migration – if there is a deficiency, the tissue can colonize more easily outside the uterus.

TRPV1 and pelvic pain: TRPV1 is highly overexpressed in nerve fibers that innervate endometriosis lesions. CBD desensitization of TRPV1 = direct pain relief at the origin of pain.

Study situation: Cannabis for endometriosis

Study Design Result
Armour et al. 2019 (J Obstet Gynaecol Can) Survey, n=484 endometriosis patients Australia, cannabis use Cannabis in top 3 most effective pain therapies; 56% reported strong pain reduction; higher effectiveness than many standard therapies
Sinclair et al. 2020 (J Altern Complement Med) Online survey, n=252, cannabis use for endometriosis 61% used cannabis for pain management; 96% reported symptom improvement; dysmenorrhea and dyspareunia most improved
Escudero-Lara et al. 2021 (eLife) Mouse model, endometriosis + CBD CBD reduces endometriosis lesion size, decreases pain sensitivity and proinflammatory markers; CB2 and PPAR-γ as mechanisms

What cannabis can help with endometriosis

Dysmenorrhea (menstrual pain): CB1 activation in the uterus inhibits prostaglandin-mediated contractions – strongest type of pain in endometriosis. THC and CBD act synergistically: THC via CB1 analgesia, CBD via TRPV1 desensitization and inhibition of inflammation.

Dyspareunia (pain during sex): Deep infiltrative endometriosis (DIE) causes severe sexual pain. Cannabis locally (CBD suppositories, lubricants) and systemically shows strong improvement in surveys. Armour 2019: Dyspareunia as one of the most improved symptoms.

Intestinal endometriosis: Intestinal endometriosis causes flatulence, cramps and diarrhea. Cannabis (CB1 in the intestine) can normalize intestinal motility and reduce pain.

Chronic pelvic pain: central sensitization in long-term endometriosis. Cannabis attenuates central sensitization via CB1 in the dorsal horn + CBD via NMDA modulation.

Practical application: What works

Systemic (for persistent pain):
– CBD 50-150 mg daily continuously (anti-inflammatory, TRPV1)
– THC 2.5-10 mg in the evening (sleep + pain peaks)
– Cannabis on prescription: indication pelvic chronic pain

Local (for sexual pain):
– CBD suppositories (100-200 mg CBD vaginally or rectally) 30 minutes before sex
– CBD lubricant for external relief
– TRPV1 desensitization locally in the affected tissue

GKV and endometriosis

Endometriosis alone is not an explicitly listed cannabis indication. Access is via:
– Chronic pelvic pain (as an indication of pain)
– Therapy resistance after hormones (gestagens, GnRH analogs) and NSAIDs
– Documented suffering and loss of quality of life

Gynecologists who specialize in pain medicine or pain clinics are the best place to go.

Study highlight: Bouaziz et al. 2017 (PLOS ONE): CBD significantly inhibited proliferation, invasion and vascularization of endometriosis lesions in vitro. Armour 2019: 13% of endometriosis patients use cannabis – with an average 7.6/10 self-assessment of efficacy.
More on the topic:

FAQ: Cannabis for endometriosis

Summary

Endometriosis and ECS are closely linked: CB1/CB2 in endometriosis tissue, anandamide deficiency as key mechanism, TRPV1 overexpression in endometriosis nerve fibers. Patient studies show cannabis in the top 3 most effective endometriosis pain therapies. CBD suppositories locally, systemic THC/CBD for persistent pain and sleep. Cannabis and sexual pain and cannabis for chronic pain for related topics.

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