Suggest Treatment For Pain In Tail Bone

Hi i'm 19 and my Tailbone has suddenly begun to ache. It hurts when I lay down on my back, when I sit down, and even when I bend over. I haven't done anything to hurt it. I was just laying in bed most of the day yesterday and when I got up, my tail bone hurt. My butt is relatively large so I question how something like this can happen suddenly without injury? Is this a serious problem?