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What is Endometriosis? Get Facts About This Chronic Disease

Author
Rina Carlini, PhD
Reviewed By

Rina Carlini, PhD and Joanne Tejeda, PhD

Published on

May 23, 2025

What is Endometriosis? Get Facts About This Chronic Disease

Endometriosis affects about 1 in 10 women and individuals with female reproductive anatomy. Endometriosis is a complex and chronic inflammatory condition where tissues that resemble the inner lining of the the uterus, the endometrium, grow in areas outside the uterus. Abnormal endometrial tissue growths are referred to as lesions. Endometriosis is categorized according to the size of lesions, location, and disease severity into 4 stages from least to most severe as Stage I, Stage II, Stage III, and Stage IV.  





Examples of endometriosis according to the location of lesions in the body include: 


  • Superficial peritoneal endometriosis (lesions on the pelvic cavity)

  • Ovarian endometriomas (lesions inside or on the ovary)

  • Deep infiltrating endometriosis (lesions on the bladder, rectovaginal septum, and sigmoid colon; this type is the most severe form)


 

Unfortunately, endometriosis is multi-factorial disease and manifests very differently from one person to the other, making its diagnosis incredibly challenging. 


Endometriosis also has a negative impact on all aspects of quality of life - from personal and work relationships to mental health. 



Symptoms

The most reported symptom is chronic pelvic pain (CPP) that worsens during the menstrual cycle. As the disease progresses, pain can evolve to include non-menstrual pelvic pain, including pain during intercourse. 


  • Other symptoms include

  • Infertility,

  • Heavy menstrual bleeding

  • Irregular bleeding (spotting in between the menstrual cycle)

  • Irregular menstrual cycle

  • Chronic inflammation

  • Migraines

  • Depression

  • Painful bladder syndrome

  • Irritable bowel syndrome (IBS)

  • Uterine fibroids and ovarian cysts



Diagnosis and Treatment

As of today, the only way to truly confirm the presence of endometriosis is through laparoscopic surgery.  Laparoscopy uses a device called a laparoscope; a thin tubular device that is equipped with a camera that is inserted into the abdomen to help guide the surgeon. During the surgery, if endometriosis is found, it is removed from the area to help relieve pelvic pain. The surgery can also temporarily aid with infertility. Despite being the current standard for diagnosis, laparoscopic procedures may not be available or recommended for some individuals as it is very invasive.


As such, alternative diagnostic methods are being explored and include: 


  • Pelvic exam

  • Transvaginal and transabdominal ultrasounds

  • Magnetic Resonance Imaging (MRI)

  • Blood biomarkers (undergoing research)


Treatment for endometriosis often involves surgery to remove lesions, or other non-surgical treatment options for the management symptoms. Examples include: 



Hormone Therapies:

  • Estrogen-progestin hormonal contraceptives (birth control pills)

  • Progestins (synthetic hormone drug)

  • Gonadotrophin-releasing hormone (GnRH) agonists

  • Danazol (androgenic steroid)



Pain Management Medication:

  • Non-steroidal anti-inflammatory drugs (NSAIDs) for pain management


 

Drug-free Pain Management Treatments: 

  • Pelvic floor therapy

  • Acupuncture

  • Cognitive therapies

  • Digital therapies

  • Heating pads and warm baths



Due to the complicated nature of endometriosis and the overlap of symptoms with other gynecological issues such as pelvic pain, there is often a delay in diagnosis of 7-10 years, which means that many individuals continue to suffer without answers.

References

[1] Symons LK, Miller JE, Kay VR, et al. The Immunopathophysiology of Endometriosis. Trends Mol Med. 2018;24(9):748-762. doi:10.1016/j.molmed.2018.07.004


[2] As-Sanie S, Black R, Giudice LC, et al. Assessing research gaps and unmet needs in endometriosis. Am J Obstet Gynecol. 2019;221(2):86-94. doi:10.1016/j.ajog.2019.02.033

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