I have had low back pain (recently diagnosed as sacroiliac) for about 6 months. It started as just a "sore back" and has progressed to basically keeping me laying down to get relief. Can't stand or sit without severe pain for more than about 2 minutes. Have been to every Dr. and had every test known to man. Am currently at an exceptional Pain Mgmt center. They tried steroid injection to the SI joints. The anesthetic worked like a champ and my pain was immediately reduced (before I even got up from the table); however it was short lived, once it wore off, there was no additional pain relief from the steroid. So the Dr is thinking it's the sacroiliac tendons, which we may try RFN to get some quick relief and we are starting prolotherapy. My main question is....I did not injure my back 6 mos ago. The ONLY change I made was starting to take Bio-Identical Hormone Replacement therapy, specifically 20-36 drops of progesterone depending on time of the month. I am reading that pregnant women get lots of SI pain from increase in hormones Relaxin and Progesterone. My question is...can the BHRT progesterone increase, by itself, cause this SI pain in a non-pregnant woman? have searched all over internet but can't find answer.