Common causes of tailbone pain?

Many: There are many possible causes for pain of the tailbone (coccyx) including trauma from childbirth or falling, degenerative joint disease, tumor, & sitting for a prolonged period on a hard surface. If this is a chronic issue it is best to have it evaluated by your physician.

See below: The tailbone or "coccyx" is the small trail of bones that connect to the end of your sacrum, and form the end of your spine. A painful tailbone can come from several things. Trauma to the tailbone which might occur with a fall. An abnormally positioned tailbone that is under stress with prolonged siting, and in very rare cases abnormal growths can occur on the tailbone.