39 years old. Low/underweight for height. Tailbone pain for 2 years (no apparent cause). Prominent bone spur (I can feel it myself). Had x-rays, MRIs and cortisone shots (2) - one helped, one didn t. The main problem is pain/pressure when I sit, or even when I lie on my back. I may try acupuncture now or even surgery (to remove spur or section of tailbone). Used to be a LOT of pain on rising from sitting. Now it s not like that, but the pain is always present when I sit. Also, should the tip of my tailbone flex when I press in on it while seated at 90 degrees?