Re: It hurts when I sit for a long time
I had that kind of pain decades ago, when I was in high school. Turns out, it was from slumping in the desk, sitting on my tailbone instead of the fleshy part of the rear end. If you do that, stopping it and taking ibuprofen according to directions may relieve the inflammation.
If you feel a lump on your tailbone that hurts to the touch or to put pressure on, you may have a pilonidal cyst. You should see a doctor for that.