Hi, I have an extreme amount of pain in my tailbone and and lower/mid back. It started in my tailbone and has moved up within the past month, so fairly quickly I would say. Also, when I am menstruating, the pain is even more severe. I am seeing a chiropractor and it is not helping. What could this be?? I have not had an x-ray down there yet. Tomorrow I will have one. Is there a chance this could be cancerous? I don't know if this has anything to do with it, but I have had mononucleosis for 5 months now. And I know that monocytes can turn into different kinds of cancers…also on my blood tests, (4 months ago) my liver count varied between 300 and 700. I do not drink alcohol. Any answers??