Direct current stimulation studies show that endometriosis can be affected via electrophysiological pathways that are not unique to pulsed electromagnetic field therapy.
The below highlighted PEMF endomitriosis study included 16 endomitriosis patients during 20 endometriosis episodes and worked dramatically to somewhat on pain symptoms.

Electrochemical therapy of pelvic pain: effects of pulsed … – NCBI

 

https://www.ncbi.nlm.nih.gov/pubmed/7531030

 

by WA Jorgensen – ‎1994 – ‎Cited by 112 – ‎Related articles

Eur J Surg Suppl. 1994;(574):83-6. … pelvic pain: effects of pulsed electromagnetic fields (PEMF) on tissue trauma. Jorgensen WA(1), Frome BM, Wallach C. Author information: (1)International Pain Research Institute, Los Angeles, California.

 
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Magnetic Therapy Endomitriosis Bibliography:

To read the original source, use Pubmed and search for Title of the citation
Eur J Surg Suppl. 1994;(574):83-6.
Electrochemical therapy of pelvic pain: effects of pulsed electromagnetic fields (PEMF) on tissue trauma.
Jorgensen WA, Frome BM, Wallach C.
Source
International Pain Research Institute, Los Angeles, California.
Abstract
Unusually effective and long-lasting relief of pelvic pain of gynaecological origin has been obtained consistently by short exposures of affected areas to the application of a magnetic induction device producing short, sharp, magnetic-field pulses of a minimal amplitude to initiate the electrochemical phenomenon of electroporation within a 25 cm2 focal area. Treatments are short, fasting-acting, economical and in many instances have obviated surgery. This report describes typical cases such as dysmenorrhoea, endometriosis, ruptured ovarian cyst, acute lower urinary tract infection, post-operative haematoma, and persistent dyspareunia in which pulsed magnetic field treatment has not, in most cases, been supplemented by analgesic medication. Of 17 female patients presenting with a total of 20 episodes of pelvic pain, of which 11 episodes were acute, seven chronic and two acute as well as chronic, 16 patients representing 18 episodes (90%) experienced marked, even dramatic relief, while two patients representing two episodes reported less than complete pain relief.

J Acupunct Meridian Stud. 2014 Feb;7(1):6-14. doi: 10.1016/j.jams.2013.02.003. Epub 2013 Mar 16.
Effects of electroacupuncture and electroacupuncture plus Tao Hong Si Wu Wan in treating primary dysmenorrhea.
Miao EY1, Miao MY2, Kildea DG3, Lao YW2.

J Sex Med. 2014 Nov 12. doi: 10.1111/jsm.12740. [Epub ahead of print]
Transcutaneous Electrical Nerve Stimulation as an Additional Treatment for Women Suffering from Therapy-Resistant Provoked Vestibulodynia: A Feasibility Study.
Vallinga MS1, Spoelstra SK, Hemel IL, van de Wiel HB, Weijmar Schultz WC.

Zhen Ci Yan Jiu. 2013 Oct;38(5):393-8.
[Cumulative analgesic effects of EA stimulation of sanyinjiao (SP 6) in primary dysmenorrhea patients: a multicenter randomized controlled clinical trial].
[Article in Chinese]
Song JS1, Liu YQ, Liu CZ, Xie JP, Ma LX, Wang LP, Zheng YY, Ma ZB, Yang H, Chen X, Shi GX, Li SL, Zhao JP, Han JX, Wang YX, Liu JP, Zhu J.

Acta Obstet Gynecol Scand. 2013 Aug;92(8):881-7. doi: 10.1111/aogs.12184. Epub 2013 Jun 22.
Nerve stimulation for chronic pelvic pain and bladder pain syndrome: a systematic review.
Tirlapur SA1, Vlismas A, Ball E, Khan KS.

BJU Int. 2013 Jul;112(2):E159-63. doi: 10.1111/bju.12005. Epub 2013 Feb 22.
Refractory chronic pelvic pain syndrome in men: can transcutaneous electrical nerve stimulation help?
Schneider MP1, Tellenbach M, Mordasini L, Thalmann GN, Kessler TM.

Urologe A. 2012 Dec;51(12):1683-91. doi: 10.1007/s00120-012-3037-9.
[Chronic pelvic pain syndrome: neurostimulation, neuromodulation and acupuncture].
[Article in German]
Walter M1, Sammer U, Kessler TM.

J Altern Complement Med. 2012 Feb;18(2):137-42. doi: 10.1089/acm.2010.0506.
Effects of noninvasive electroacupuncture at Hegu (LI4) and Sanyinjiao (SP6) acupoints on dysmenorrhea: a randomized controlled trial.
Wu LL1, Su CH, Liu CF.

Gynecol Obstet Invest. 2012;73(2):99-105. doi: 10.1159/000328447. Epub 2012 Jan 20.
Effects of percutaneous tibial nerve stimulation therapy on chronic pelvic pain.
Gokyildiz S1, Kizilkaya Beji N, Yalcin O, Istek A.

J Obstet Gynaecol Res. 2011 Jul;37(7):750-3. doi: 10.1111/j.1447-0756.2010.01425.x. Epub 2011 Mar 13.
Effect of transcutaneous electrical nerve stimulation on the postpartum dyspareunia treatment.
Dionisi B1, Senatori R.