Endometriosis is a debilitating condition that affects 1 in 10 women. It is a long-term condition where tissue similar to the lining of the womb grows in other places, such as the ovaries, Fallopian tubes and the tissue lining the inside of the pelvis. It is also becoming more common for the tissue to be found in and around other organs including bladder, bowel, appendix and lungs. With endometriosis, the endometrial-like tissue acts as endometrial tissue would - it thickens, breaks down and bleeds with each menstrual cycle. But because this tissue has no way to exit your body, it becomes trapped. When endometriosis involves the ovaries, cysts called endometriomas may form. Surrounding tissue can become irritated, eventually developing scar tissue and adhesions - abnormal bands of fibrous tissue that can cause pelvic tissues and organs to stick to each other. It is a chronic and debilitating condition that causes painful or heavy periods. It may also lead to infertility, fatigue and bowel and bladder problems. Around 1.5 million women in the UK are currently living with the condition. It is not clear what causes endometriosis. It may be linked to things like your genes or a problem with your immune system. Endometriosis can affect girls and women of any age, regardless of race or ethnicity and can cause a significant impact on your life, at present there is no cure but there are many treatments available which will help make the symptoms more manageable. Unfortunately many women diagnosed with endometriosis will also suffer from other conditions and complications. It is important to remember that endometriosis is not an infection, it is not contagious and it isn't cancer. Whilst endometriosis is a very common condition, it is not yet fully understood and awareness and education is needed to rectify this.