The coccyx is the small bone (actually a few small bones fused together) at the very base of the spine. After the lumbar spine (lower back) is the large bone called the sacrum. At the very bottom tip of the sacrum is the coccyx. If we were still in our more primitive evolutionary state the [...]The post Tailbone pain isn't fun. Here is what you should do if your coccyx is hurting! appeared first on Dr. Allan Horowitz.