Endometriosis is most often manifested by pelvic pain, though not always, as it may be a finding of infertility determined after exclusion of other causes. The interesting thing about endometriosis is that it can have "minimal" operative findings and can cause severe pain while more advanced stages can have minimal symptoms.
Endometriosis is common and, in some cases, has a chronic, progressive course leading to multiple surgeries and treatment modalities (hormonal/menstrual suppression) that may not ultimately result in a complete cure. You can get more information about endometriosis symptoms & diagnosis via Endometriosisassn.org.
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Those who have it will likely learn very little from this article as it is a condition one tends to research extensively if they are suspected of having it. It can be painful and cause scarring which leads to secondary problems such as infertility, and chronic issues potentially involving the bladder, bowel and other organs. Or it can be minimal and resolve with treatment.
Whether the treatment one receives is Lupron, surgery or ultimately hysterectomy for severe cases (hopefully after childbearing) the treatment options are not the objective of this article as this information can only come from your primary provider treating you for this condition who knows your findings.
Endometriosis is when the menstrual "endometrial" tissue (which is suppose to exist solely within the uterine cavity) proliferates in the pelvis or other parts of the body. Theories have existed for years as to how this develops. One theory has been proposed that there are cells that differentiate spontaneously into endometrial cells (menstrual tissue).