Thank you so much for your explanation. I went to the Doctor because my lower back was hurting so bad that it was hard to walk several feet at a time. My 1st explain he was going to do a urine culture, 2nd a pap smear, 3rd Ultra Sound. The Urine culture came back negative, but the Ultrasound came back explaining everything you said. I had a small cyst, and thicken of lining and some active cells. I will find out on Tuesday 07/02/2013 what the results will bring. When you explained some of the reason for the thickening of the lining, it was interesting because I have Thyroid, in which I take 1 pill every day, and I have been dealing with a great deal of stress. I feel so much better since I read your explanation and also I was not alone in going through this. I will report the finding when I get them. At this moment I am still dealing with my back, I am taking IB for the pain.