hi thanks for writing to healthcaremagic the part of bone at the tip of sacrum is called coccyx (tailbone)and you seem tosuffer from a condition called coccygodynia (swelling of soft tissue around your tailbone) as there is no history of injury the chances of fracture are very less. please take following treatment: 1. for sitting -use ring pillow or doughnut cushion with a hole in between. (this will offload your tail bone). 2. do not sit on any kind of hard surface 3. avoid sitting for long 4. do seitz bath( dip your buttocks in a tub of lukewarm water).if not possible lie down sideways and do hot fomentation. 5. avoid any strenuous activities, lifting any kind of weight 6. take mild antiinflammatory like ibuprofen or naproxen 7. avoid constipation, take high fibre diet and increase water intake. it will 2-3 weeks for recovery. if no relief , you can see your orthopaedic surgeon. he might consider giving a local steroid injection. hope i have answered your query . if satisfied please rate my answer. thank you