The coccyx is the last part of your backbone. Many people also call it a “tailbone” but the true medical name is a coccyx. This nickname makes sense though, because it is basically the remnants of what was once our tail before we lost it. In humans, there are still many muscles attached to this bone.
Pain is sometimes felt in this bone, normally through injury. Women can also injure this bone during childbirth. Usually, this is only mild pain and general painkillers are enough.
Personally, I have had this pain myself a few months ago after falling whilst sitting. I had a mild pain lasting for a few days which eventually went away.
If your pain is much worse or does not go away then I would advise speaking to the doctor. The problem itself could be a number of things and only a medical professional can diagnose it.
One thing to remember is that this bone is actually fragmented in most people so if a doctor examines you and diagnoses a “fracture”, they may actually be misdiagnosing the true cause of your problem. This is because the coccyx is not a single bone but actually a number of small vertebrae that are fused together.
Again, the main thing is to see your doctor of medical professional if the pain does not start to go away within a couple of days. Unfortunately, some people have to live with the pain and a true fracture does not heal as well as e.g. a leg or an arm.
In these cases, the most important thing is to manage the pain effectively.
If you have chronic back pain then you may want to check out this site: Cure Back Pain.