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{{#invoke:Infobox|infobox}} Endometriosis is a disease in which tissue that normally grows inside the uterus grows outside it.<ref>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref> The main symptoms are pelvic pain and infertility. Nearly half of those affected have chronic pelvic pain, while in 70% pain occurs during menstruation. Pain with sex is also common. Infertility occurs in up to half of women affected.<ref name=Bulletti2010/> Less common symptoms include urinary or bowel symptoms. About 25% of women have no symptoms.<ref name=Bulletti2010/> Endometriosis can have both social and psychological effects.<ref>{{#invoke:Citation/CS1|citation |CitationClass=journal }}</ref>

The cause is not entirely clear.<ref name=Bulletti2010/> Risk factors include having a family history of the condition. Most often the ovaries, fallopian tubes, and tissue around the uterus and ovaries are affected; however, in rare cases it may also occur in other parts of the body.<ref name=WH2014/> The areas of endometriosis bleed each month which results in inflammation and scarring.<ref name=Bulletti2010/><ref name=WH2014/> The growths due to endometriosis are not cancer. Diagnosis is usually based on symptom in combination with medical imaging. Biopsy is the most sure method of diagnosis.<ref name=WH2014/> Other causes of similar symptoms include irritable bowel syndrome, interstitial cystitis, and fibromyalgia.<ref name=Bulletti2010/>

Tentative evidence suggests that the use of combined oral contraceptives reduces the risk of endometriosis.<ref name=Ver2011>{{#invoke:Citation/CS1|citation |CitationClass=journal }}</ref> Exercise and avoiding large amount of alcohol may also be preventative.<ref name=WH2014/> There is no cure for endometriosis, but a number of treatments may improve symptoms.<ref name=Bulletti2010/> This may include pain medication, hormonal treatments, or surgery. The recommended pain medication is usually an NSAID such as naproxen. Taking the active component of the birth control pill continuously or an intrauterine device with progestogen may also be useful. Gonadotropin-releasing hormone agonist may improve the ability of those who are infertile to get pregnant. Surgical removal of endometriosis may be done in those whose symptoms are not manageable with other treatment.<ref name=WH2014>{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>

Endometriosis is estimated to occur in roughly 6–10% of women.<ref name=Bulletti2010>{{#invoke:Citation/CS1|citation |CitationClass=journal }}</ref> It is most common in those in their thirties and forties.<ref name=WH2014/> It results in few deaths with this being estimated at 200 globally in 2013.<ref name=GDB2013>{{#invoke:Citation/CS1|citation |CitationClass=journal }}</ref> Endometriosis was first determined to be a separate condition in the 1920s. Before that time endometriosis and adenomyosis were considered together. It is unclear who first described the disease.<ref name=Bro2012>{{#invoke:citation/CS1|citation |CitationClass=book }}</ref>

Endometriosis sections
Intro  Signs and symptoms  Risk factors  Pathophysiology  Diagnosis  Prevention  Management  Prognosis  Epidemiology  History  Society and culture  References  External links  

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