What can cause tail bone pain?

Coccydynia.: This sounds like coccydynia, which is a pain in the tail bone which occurs after sitting on a hard surface for a long time or from falling onto your tail bone onto a hard surface. Can take a long time to heal up. You can try sitting on a "donut", that soft cushion with a hole in the middle that you find at the surgical supply stores. Anti inflammatories and heat may help.

See below: Sounds like you have coccydynia or 'tailbone pain'. This can occur with trauma to the tail bone, abnormally positioned coccyx, or poor sitting posture. Try using a good lumbar support to help shift your pelvis forward. This will put the pressure on your ischium. (bottom part of pelvic bone), and will shift the weight off of your coccyx (tailbone).