I was recently having pain on my left side when it was "that time of the month." I went to the doctor about it. The doctor did an ultrasound and discovered that the discomfort was caused by a minor little bit of endometriosis (sp?). He said that it was minor, but he was glad to have done the ultrasound because on the right side there was a large mass on my ovary. It's probably something nonmalignant, but we aren't taking any chances. I'm going to have surgery in about 2 weeks. It's strange how things work out. I never thought that I would have been thankful for endometriosis, but I would have never learned about what could potentially become a silent killer without it. Thank you, God!