You've asked this question previously and I answered then. Your doctor would do an exam of your lower back-- an external exam. If necessary he might ask for x rays but in truth, typically for a tail bone injury they don't. It could be just lower back pain. Please refer back to your previous time asking this exact question. good luck
How will they examine it?
I think it is related to a sports injury. A physical therapist could probably straighten this out, but you need a referral.