Hello.. this pain is mostly associated with some inflammation around the tail bone.. it is called coccydynia..
Was there any injury or jerk over that region..
Next Steps
You can start with hot fomentation by starting Sitz bath, sitting in a tub of warm water for 10 -15 min. for 2 to 3 times daily.. You can also start with analgesic with anti inflammatory tablet. You can get a ring cushion and place it on seat before sitting. it will prevent pressure over the coccygeal region..
Health Tips
Avoid sitting on a hard chair.. or sitting with tilting backwards. that may cause pain.. If not relieved, you can get one x ray of coccygeal region..