Endometriosis (pronounced end - oh – mee – tree – oh – sis) is the name given to the condition where cells like the ones in the lining of the womb (uterus) are found elsewhere in the body. Every month your body goes through hormonal changes. You naturally release hormones which cause the lining of the womb to increase in preparation for a fertilised egg. If pregnancy does not occur, this lining will break down and bleed. The blood is then released from your body as a period. Endometriosis cells react in the same way – except that they are located outside your womb. During your monthly cycle your hormones stimulate the endometriosis, causing it to grow, then break down and bleed. This internal bleeding, unlike a period, has no way of leaving the body. This leads to inflammation, pain, and the formation of scar tissue (adhesions). Endometrial tissue can also be found in the ovary, where it can form cysts, called ‘chocolate cysts’ because of their appearance.