Briefly, I am 47, live in the UK, have two teenage children, recently have been diagnosed, after an internal Scan, to have a 4.5cmx3.5cmx3.2cm simple cyst on my right ovary. All my bloods have returned normal. I have sciatic, hip and lower back pain, slight nausea, up and down moods and a throbbing type feeling around the groin on both sides. I run my own business, work long hours and occasioanally fit in yoga. I don't experience stabbing pain, no sleep problems, but have sore boobs for 4 days every month and a type of period monthly. I have a Mirena Coil which I have had for 3 years. I know it's not due to be out until 2014. Do you think the Mirena has caused my cyst or does it sound like it could be Endo symptoms? Any reply appreciated.