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Classification & external resources
ICD-10 N80.
ICD-9 617.0
OMIM 131200
DiseasesDB 4269
MedlinePlus 000915
eMedicine med/3419  ped/677 emerg/165
MeSH D004715

Endometriosis is a common medical condition characterized by growth of tissue like endometrium, the lining of the uterus, beyond or outside the uterus.

Affecting an estimated 89 million lucys (usually around 30 to 40 years of age who have never been pregnant before) of reproductive age around the world, one in every 5 females get endometriosis.[1] .[citation needed] However, endometriosis can occur very rarely in postmenopausal women.[1] An estimated 2%-4% of endometriosis cases are diagnosed in the postmenopausal period.

In endometriosis, the endometrium (from endo, "inside", and metra, "womb") is found to be growing outside the uterus, on or in other areas of the body. Normally, the endometrium is shed each month during the menstrual cycle; however, in endometriosis, the misplaced endometrium is usually unable to exit the body. The endometriotic tissues still detach and bleed, but the result is far different: internal bleeding, degenerated blood and tissue shedding, inflammation of the surrounding areas, pain, and formation of scar tissue may result. In addition, depending on the location of the growths, interference with the normal function of the bowel, bladder, small intestines and other organs within the pelvic cavity can occur. In very rare cases, endometriosis has also been found in the skin, the lungs, the eye, the diaphragm, and the brain.



A major symptom of endometriosis is severe recurring pain. The amount of pain a woman feels is not necessarily related to the extent or stage (1 through 4) of endometriosis. Some women will have little or no pain despite having extensive endometriosis affecting large areas or having endometriosis with scarring. On the other hand, women may have severe pain even though they have only a few small areas of endometriosis.

Symptoms of endometriosis can include (but are not limited to):

  • Painful, sometimes disabling menstrual cramps (dysmenorrhea); pain may get worse over time (progressive pain)
  • Chronic pain (typically lower back pain and pelvic pain, also abdominal)
  • Painful sex (dyspareunia)
  • Painful bowel movements (dyschezia) or painful urination (dysuria)
  • Heavy menstrual periods (menorrhagia)
  • Nausea and vomiting
  • Premenstrual or intermenstrual spotting (bleeding between periods)
  • Infertility and subfertility. Endometriosis may lead to fallopian tube obstruction. Even without this, there may be difficulty conceiving. In some women, subfertility is the sole symptom, and the endometriosis is only discovered after fertility investigations.
  • Bowel obstruction (possibly including vomiting, crampy pain, diarrhea, a rigid and tender abdomen, and distention of the abdomen, depending on where the blockage is and what is causing it) or complete urinary retention.

In addition, women who are diagnosed with endometriosis may have gastrointestinal symptoms that may mimic irritable bowel syndrome, as well as fatigue.

Patients who rupture an endometriotic cyst may present with an acute abdomen as a medical emergency. Endometriotic cysts in the thoracic cavity may cause some form of thoracic endometriosis syndrome, most often catamenial pneumothorax.


In the US: Endometriosis occurs in 7-10% of women in the general population (Wheeler, 1989). It is an estrogen-dependent disease and, thus, usually affects reproductive-aged women. Endometriosis has a prevalence rate of 20-50% in infertile women (Rawson, 1991; Strathy, 1982; Verkauf, 1987) and as high as 80% in women with chronic pelvic pain (Carter, 1994). Evidence of endometriosis was found during laparoscopy in 20-50% of asymptomatic women (Williams, 1977). Approximately 4 per 1000 women are hospitalized with endometriosis each year. A familial association exists, with a 10-fold increased incidence in women with an affected first-degree relative (Cramer, 1987). Monozygotic twins are markedly concordant for endometriosis (Hadfield, 1997).[2]


Endometriosis can affect any woman, from premenarche to postmenopause, regardless of her race, ethnicity or whether or not she has had children. Endometriosis often persists after menopause. Endometriosis in postmenopausal women is an extremely aggressive form of this disease characterized by complete progesterone resistance and extraordinarily high levels of aromatase expression.[3] A majority of 50 postmenopausal women diagnosed with endometriosis had no previous history of the disease. In less common cases, girls may have endometriosis before they even reach menarche.[4][5]

Current estimates place the number of women with endometriosis at between 5% and 20% of women of reproductive age. About 30% to 40% of women with endometriosis are infertile, making it one of the leading causes of infertility. However, endometriosis-related infertility is often treated successfully with surgical destruction of the disease. Some women do not find out that they have endometriosis until they have trouble getting pregnant. While the presence of extensive endometriosis distorts pelvic anatomy and thus explains infertility, the relationship between early or mild endometriosis and infertility is less clear. The relationship between endometriosis and infertility is an active area of research.

Early endometriosis typically occurs on the surfaces of organs in the pelvic and intraabdominal areas. Health care providers may call areas of endometriosis by different names, such as implants, lesions, or nodules. Larger lesions may be seen within the ovaries as endometriomas or chocolate cysts (They are termed chocolate because they contain a thick brownish fluid, mostly old blood). Endometriosis may trigger inflammatory responses leading to scar formation and adhesions. Most endometriosis is found on structures in the pelvic cavity:

Endometriosis may spread to the cervix and vagina or to sites of a surgical abdominal incision. In extremely rare cases, endometriosis areas can grow in the lungs or other parts of the body.

Surgically, endometriosis can be staged I-IV (Revised Classification of the American Society of Reproductive Medicine).[6]


While the exact cause of endometriosis remains unknown, many theories have been presented to better understand and explain its development. These concepts do not necessarily exclude each other.

  1. Endometriosis is a condition caused by excess estrogen created each month in the female body, and is seen primarily during the reproductive years. In experimental models, excess estrogen is necessary to induce or maintain endometriosis. Medical therapy is often aimed at lowering estrogen levels to control the disease. It is hypothesized that excess estrogen levels may be measured by a female taking her morning temperature (with a thermometer showing a tenth decimal) at the same time each day for a month or two. To learn more about taking your waking temperature, please see the book: "Taking Charge of Your Fertility" by Toni Weschler, MPH. A normal woman's body temperature varies from 98.5 to 97.5 degrees Fahrenheit (36.9 to 36.3 degrees Celsius), however it is hypothesized that someone with endometriosis may see temperatures of 98.5 to 97.0 °F (36.9 to 36.1 °C). The lower temperatures signify the estrogen phase of a normal female's cycle, therefore it is logical that women with excessively lower body temperatures, may have an excess of estrogen, thus endometriosis. Research is needed to determine the reliability of using waking temperatures to diagnose endometriosis and its severity. Additionally, the current research into Aromatase, an estrogen-synthesizing enzyme produced by the implants themselves, has provided evidence as to why and how the disease persists after menopause and hysterectomy.
  2. "Retrograde menstruation", in which some of the menstrual debris of menstruation flows into the pelvis, may play an important role (John A. Sampson). While most women may have some retrograde menstrual flow, typically their immune system is able to clear the debris and prevent implantation and growth of cells from this occurrence. However, in some patients, endometrial tissue transplanted by retrograde menstruation is able to implant and establish itself as endometriosis. Factors that might cause the tissue to grow in some women, but not in others, need to be studied, and some of the possible causes below may provide some explanation, e.g. hereditary factors, toxins, or a compromised immune system. It can be argued that the uninterrupted occurrence of regular menstruation month after month for decades, is a modern phenomenon, as in the past women had more frequent menstrual rest due to pregnancy and lactation.
  3. A competing theory suggests that endometriosis does not represent transplanted endometrium but starts de novo from local stem cells. This process has been referred to as coelomic metaplasia. Triggers of various kind (including menses, toxins, or immune factors) may be necessary to start this process.
  4. Hereditary factors play a role. It is well recognized that daughters or sisters of patients with endometriosis are at higher risk of developing endometriosis themselves. A recent study (2005) published in the American Journal of Human Genetics found a link between endometriosis and chromosome 10q26.[7] One study found that, in female siblings of patients with endometriosis the relative risk of endometriosis is 5.7:1 versus a control population.[8]
  5. It is accepted that in specific patients endometriosis can spread directly. Thus endometriosis has been found in abdominal incisional scars after surgery for endometriosis.
  6. On rare occasions endometriosis may be transplanted by blood or by the lymphatic system into peripheral organs (e.g. lungs, brain).
  7. Recent research is focusing on the possibility that the immune system may not be able to cope with the cyclic onslaught of retrograde menstrual fluid. In this context there is interest in studying the relationship of endometriosis to autoimmune disease, allergic reactions, and the impact of toxins.[9]
  8. There's a growing sentiment that there are environmental factors which may cause endometriosis; specifically some plastics, and cooking with certain types of plastic containers with microwave ovens.[2]

Another area of research is the search for endometriosis markers. These markers are substances made by or in response to endometriosis that health care providers can measure in the blood, urine, or daily waking temperature. If markers are found, health care providers could diagnose endometriosis by testing a woman's blood, urine, or daily waking temperature, which might reduce the need for surgery. CA-125 is known to be elevated in many patients with endometriosis,[10] but not specifically indicative of endometriosis.

A small-scale 1995 study by University of Louisville School of Medicine suggests "an association between the occurrence of natural red hair and those factors that lead to the development of endometriosis".[11]


A health history and a physical examination can in many patients lead the physician to suspect the diagnosis.

Use of imaging tests may identify larger endometriotic areas, such as nodules or endometriotic cysts. The two most common imaging tests are ultrasound and magnetic resonance imaging (MRI). Normal results on these tests do not eliminate the possibility of endometriosis--areas of endometriosis are often too small to be seen by these tests.

The only sure way to confirm an endometriosis diagnosis is by laparoscopy. The diagnosis is based on the characteristic appearance of the disease, if necessary corroborated by a biopsy. Laparoscopy also allows for surgical treatment of endometriosis.

Generally, endometriosis-directed drug therapy (other than the oral contraceptive pill) is utilized after a confirmed surgical diagnosis of endometriosis.

Cause of pain

The way endometriosis causes pain is the subject of much research. Because many women with endometriosis feel pain during or related to their periods and may spill further menstrual flow into the pelvis with each menstruation, some researchers are trying to reduce menstrual events in patients with endometriosis.

Endometrial tissue reacts to hormonal stimulation and may "bleed" at the time of menstruation. It accumulates locally, causes swelling, and triggers inflammatory responses with activation of cytokines. It is thought that this process may lead to pain perception.

Endometriosis is thought to be an auto-immune condition and if the immune system is compromised with a food intolerance, then removing that food from the diet can, in some people, have an effect. Common intolerances in people with endometriosis are wheat and dairy.[12]

Women with endometriosis frequently suffer from painful ovarian cysts, making ovulation quite painful. Sometimes, the cysts burst and can cause life-threatening infections in the pelvic cavity.

Women with endometriosis commonly have problems with extraordinarily painful periods and severe cramps. The bleeding can be profound and continue for weeks, leading some women to require iron supplements and even blood transfusions. These women are usually treated with birth control pills, hormone therapies, IUDs with hormones, drugs that induce menopause, or even hysterectomy to stop the dysmenorrheal symptoms.

While the menstrual pain itself can be quite excruciating, it is not the only time a person with endometriosis suffers. The lesions cause scar tissue to grow in the abdomen (and sometimes elsewhere), which bind internal organs to each other. Fallopian tubes, ovaries, the uterus, the bowels, and the bladder can be permanently damaged. This kind of pain is more debilitating on a daily basis and goes on for years, yet most sources of information seem to focus on menstrual symptoms.[citation needed]

When a woman suffers from endometriosis long enough, the pain may go from the original site to include back pain as well. This symptom is rarely discussed by doctors, despite the fact it is quite common.[citation needed]

Through all this, there is the pain encountered from multiple surgeries. Laparoscopy, laparotomy, hysterectomy, oophorectomy, bowel and bladder surgeries are all common and a woman usually goes through many before menopause finally gives her the best relief from pain.


Currently, there is no known cure for endometriosis, though in some patients menopause (natural or surgical) will abate the process. Nevertheless, a hysterectomy and/or removal of the ovaries will not guarantee that the endometriosis areas and/or the symptoms of endometriosis will not come back. Conservative treatments usually try to address pain or infertility issues. Medical herbal treatments can sometimes be effective in controlling the disease.

It is suggested but unproven that pregnancy and childbirth can stop endometriosis.[citation needed] Other treatments for endometriosis pain include:


NSAIDs and other pain medication: They often work quite well as they not only reduce pain but also menstrual flow. They are commonly used in conjunction with other therapy. For more severe cases narcotic prescription drugs may be used. Gonadotropin Releasing Hormone (GnRH) Agonist: These agents work by increasing the levels of GnRH. Consistent stimulation of the GnRH receptors results in downregulation. This causes a decrease in FSH and LH, thereby decreasing estrogen and progesterone levels. Hormone suppression therapy: This approach tries to reduce or eliminate menstrual flow and estrogen support. Typically, it needs to be done for several months or even years.

  • Progesterone or Progestins: Progesterone counteracts estrogen and inhibits the growth of the endometrium. Such therapy can reduce or eliminate menstruation in a controlled and reversible fashion. Progestins are chemical variants of natural progesterone.
  • Avoiding products with xenoestrogens, which have a similar effect to naturally produced estrogen and can increase growth of the endometrium.
  • Continuous hormonal contraception consists of the use of combined oral contraceptive pills without the use of placebo pills, or the use of NuvaRing or the contraceptive patch without the break week. This eliminates monthly bleeding episodes.
  • Danazol (Danocrine) and gestrinone are suppressive steroids with some androgenic activity. Both agents inhibit the growth of endometriosis but their use remains limited as they may cause hirsutism. There has been some research done at Case Western Reserve University on a topical Danocrine, applied locally, which has not produced the hirsutism characteristics. The study has not yet been published in a medical journal.
  • Gonadotropin releasing hormone agonists (GnRH agonists) induce a profound hypoestrogenism by decreasing FSH and LH levels. While quite effective, they induce unpleasant menopausal symptoms, and over time may lead to osteoporosis. To counteract such side effects some estrogen may have to be given back (add-back therapy).
  • Aromatase inhibitors are medications that block the formation of estrogen and have become of interest for researchers who are treating endometriosis.[13]


Surgical treatment is usually a good choice if endometriosis is extensive, or very painful. Surgical treatments range from minor to major surgical procedures.

  • Laparoscopy is very useful not only to diagnose endometriosis, but to treat it. With the use of scissors, cautery, lasers, hydrodissection, or a sonic scalpel, endometriotic tissue can be ablated or removed in an attempt to restore normal anatomy. Studies have shown that with true excision [3] such as the Redwine Method, recurrence rates are less than 20%.
  • Laparotomy can be used for more extensive surgery either in attempt to restore normal anatomy, or at least preserve reproductive potential.
  • Hysterectomy (removal of the uterus and surrounding tissue) and bilateral salpingo-oophorectomy (removal of the fallopian tubes and ovaries).
  • Bowel resection can be useful if there is bowel involvement.
  • For patients with extreme pain, a presacral neurectomy may be indicated where the nerves to the uterus are cut.

Serotonin modulation

Serotonin modulation involves raising one's serotonin levels. Low serotonin levels reduce the pain threshold, and make people more susceptible to pain.

  • Many people like sweets: eating sugar or chocolate temporarily increases serotonin levels, but creates a rebound effect, characterized by heightened PMS symptoms.
  • Melatonin and serotonin levels are increased, and levels of the stress hormone cortisol are decreased, by meditation. Melatonin causes the onset of the delta sleep phase, during which period Human Growth Hormone is released. As melatonin levels drop from childhood (100%) to age 20 (30%) and age 30 (20%)[citation needed], recovering takes more time, so good sleep is essential.
  • Serotonin is manufactured by the body from tryptophan. This amino acid is found in many foods, including soy, turkey, chicken, halibut, and beans.
  • Lavender, primarily in the form of oil, has been found to reduce several physiological parameters of stress[citation needed] by stimulating serotonin and inducing a feeling of calm and happiness.
  • Light therapy increases serotonin levels.[citation needed] Women particularly need adequate amounts of full-spectrum light during the second half of their menstrual cycles, when their serotonin levels may already be low.


Complementary or Alternative medicine are used by many women who get great relief from the pain and discomforts from a variety of available treatments.

  • Nutrition: There has been research[citation needed] showing that prostaglandins series 1 and 3 have an anti inflammatory effect which can help with endometriosis. Nutrition can also help to boost the immune system, which is important if endometriosis is an auto-immune disorder.
  • Avoid coffee and alcohol. Both can increase the levels of estrone.[citation needed]
  • While it can't cure endometriosis, acupuncture can be quite effective at treating the pain associated with menstrual cramps, back symptoms, and endometriosis adhesions.[citation needed]


Proper counseling of patients with endometriosis requires attention to several aspects of the disorder. Of primary importance is the initial operative staging of the disease to obtain adequate information on which to base future decisions about therapy. The patient's symptoms and desire for childbearing dictate appropriate therapy. Most patients can be told that they will be able to obtain significant relief from pelvic pain and that treatment will assist them in achieving pregnancy.[1]


The main complication of endometriosis is impaired fertility. Approximately one-third to one-half of women who have difficulty becoming pregnant have endometriosis.

For pregnancy to occur, an egg must be released from an ovary and travel through the fallopian tube to the uterus (womb), where it can be fertilized by a male's sperm and then attach to the uterine wall to begin development. Endometriosis can produce adhesions that can trap the egg near the ovary. It may inhibit the mobility of the fallopian tube and impair its ability to pick up the egg. In most cases, however, endometriosis probably interferes with conception in more complex ways.

  • Internal scarring
  • Adhesions
  • Pelvic cysts
  • Chocolate cysts
  • Ruptured cyst
  • Infertility - occurs in about 30-40% of cases.

Complications of endometriosis consist of bowel and ureteral obstruction resulting from pelvic adhesions. Rarely, endometriosis can be extraperitoneal and is found in the lungs and CNS.[14]


Endometriosis is associated with a lowered fertility and is the second leading cause of infertility in females that ovulate normally (the leading cause is pelvic inflammatory disease).

Treatment of infertility

Laparoscopy to remove or vaporize the growths in women who have mild or minimal endometriosis is effective in improving fertility. One study has shown that surgical treatment of endometriosis approximately doubles the fecundity (pregnancy rate).[15]

In patients with small amounts of endometriosis treatment with fertility medication clomiphene may lead to success. This drug stimulates ovulation.

Lipiodol flushing may increase fecundity.

In-vitro fertilization (IVF) procedures are effective in improving fertility in many women with endometriosis. IVF makes it possible to combine sperm and eggs in a laboratory and then place the resulting embryos into the woman's uterus. IVF is one type of assisted reproductive technology that may be an option for women and families affected by infertility related to endometriosis.

Relation to cancer

Endometriosis is not the same as endometrial cancer. However it is hypothesized that the excess estrogen creation and abnormal cell growth caused by endometriosis may eventually cause ovarian or other cancers over a woman's lifetime. The staging of endometriosis is similar to the staging of cancers, as well, in the sense that they both gauge the spread of disease in a similar fashion to different zones of the body. Current research has demonstrated an association between endometriosis and certain types of cancers.[16][17] Endometriosis often also coexists with leiomyoma or adenomyosis, as well as autoimmune disorders.


  1. ^ a b Sanaz Memarzadeh, MD, Kenneth N. Muse, Jr., MD, & Michael D. Fox, MD (September 21 2006). Endometriosis. Differential Diagnosis and Treatment of endometriosis.. Armenian Health Network, Retrieved on 2006-12-19.
  2. ^ Dharmesh Kapoor and Willy Davila, 'Endometriosis', eMedicine (2005).
  3. ^ Aromatase Expression in Postmenopausal Endometriosis. Aromatase in Aging Women. Medscape (1999). Retrieved on 2007-9-23.
  4. ^ Batt RE; Mitwally MF (2003-12-01). "Endometriosis from thelarche to midteens: pathogenesis and prognosis, prevention and pedagogy". Journal of pediatric and adolescent gynecology 16 (6): 337–47. PMID 14642954. Retrieved on 2006-04-15.
  5. ^ Marsh EE; Laufer MR (2005-03-01). "Endometriosis in premenarcheal girls who do not have an associated obstructive anomaly". Fertility and sterility 83 (3): 758–60. PMID 15749511. Retrieved on 2006-04-15.
  6. ^ (1997) "Revised American Society for Reproductive Medicine classification of endometriosis: 1996". Fertil. Steril. 67 (5): 817–21. PMID 9130884.
  7. ^ Treloar SA, Wicks J, Nyholt DR, Montgomery GW, Bahlo M, Smith V, Dawson G, Mackay IJ, Weeks DE, Bennett ST, Carey A, Ewen-White KR, Duffy DL, O'connor DT, Barlow DH, Martin NG, Kennedy SH. Genomewide linkage study in 1,176 affected sister pair families identifies a significant susceptibility locus for endometriosis on chromosome 10q26. Am J Hum Genet. 2005 Sep;77(3):365-76. Epub 2005 July 21. PMID 16080113. Full Text.
  8. ^ Kashima K, Ishimaru T, Okamura H, Suginami H, Ikuma K, Murakami T, Iwashita M, Tanaka K. Familial risk among Japanese patients with endometriosis. Int J Gynaecol Obstet. 2004 Jan;84(1):61-4. PMID 14698831
  9. ^ Capellino S, Montagna P, Villaggio B, Sulli A, Soldano S, Ferrero S, Remorgida V, Cutolo M. Role of estrogens in inflammatory response: expression of estrogen receptors in peritoneal fluid macrophages from endometriosis. Ann N Y Acad Sci. 2006 Jun;1069:263-7. PMID 16855153
  10. ^ do Amaral V, Ferriani R, de Sá M, Nogueira A, e Silva J, e Silva A, de Moura M (2006). "Positive correlation between serum and peritoneal fluid CA-125 levels in women with pelvic endometriosis". Sao Paulo Med J 124 (4): 223-7. PMID 17086305.
  11. ^ Woodworth SH, Singh M, Yussman MA, Sanfilippo JS, Cook CL, Lincoln SR. (1995). "A prospective study on the association between red hair color and endometriosis in infertile patients.". Fertility and Sterility J 64 (3): 651-2. PMID 7641926.
  12. ^ Dian Mills & Michael Vernon. "Endometriosis A Key to Healing and Fertility through Nutrition"
  13. ^ Attar E, Buttun SE. Aromatase inhibitors: the next generation of therapeutics for endometriosis? Fertil Steril 2006;85:1307-18 PMID 16647373
  14. ^ Shawn Daly, MD, Consulting Staff, Catalina Radiology, Tucson, Arizona (October 18 2004). Endometrioma/Endometriosis. WebMD. Retrieved on 2006-12-19.
  15. ^ Marcoux S, Maheux R, Berube S. Laparoscopic surgery in infertile women with minimal or mild endometriosis. Canadian Collaborative Group on Endometriosis. N Engl J Med. 1997 July 24;337(4):217-22. PMID 9227926.
  16. ^ Endometriosis cancer risk. (5 July 2003). Retrieved on 2007-07-03.
  17. ^ Roberts, Michelle (3 July 2007). Endometriosis 'ups cancer risk'. BBC News. BBC / Retrieved on 2007-07-03.

See also

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Endometriosis". A list of authors is available in Wikipedia.
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