This condition is called coccydynia,that is inflammation of tail bone causes can be trauma - fall on stairs or some elevated surface
-Repeated stress due to prolonged sitting
-In females can be due to ligament stretching during delivery.
Next Steps
get xray of coccyx lateral view.
most of the cases r treated conservatively
take sitz bath ( sit in warm water tub) for 20 minutes ,2-3 times a day .
can consult me for further management
Health Tips
avoid hard surfaces sitting
avoid sitting in jerry/ slipping seats in bike or buses.
use air cushion / heavy foam for sitting