<s>[INST] My 13 year old daughter has been complaining of tail bone pain.  She is very athletic...just finished playing school volleyball and running cross country.  She cannot remember injuring it.  She is currently in off season athletics where the do workouts on a hard surface.  I think this may be the cause, but not sure. [/INST] Hi. The actual cause could be excessive pressure on the tail bone while doing exercises on hard surface...without her knowledge she could have landed on or exert pressure over tail bone. It can also cause due to tight glute muscle pulling fascia of the tail London worry.... Let her first offload her weight from tail bone...let her sit on soft surface or over a Tyre like structure with Hole in the center... Apply a lot of ice over the painful area frequently... If you have any Anti-inflammatory medication given to her earlier let her have them for 3 days.  Gently knead over the butt muscles... Gently stretch her butt muscles and performs muscles.... Let her work more on endurance kind of strengthening....on her gluteus.... Hope this is helpful for you... Kindly revert in case you need any further help in this regard.... </s>