My tailbone has given me problems for a long time. Ever since I was 12/13 yrs old and jumped off a deck onto some freshly rained on hard packed sand, right on my butt! What an idiot move. Took months to heal and seems rather prone to re-injury. I always assumed I bruised it, but never got x-rays or anything, so it could very well have broken and not healed correctly. Thankfully though, it gave me no trouble when DD1 was born!