### instruction:
If you are a doctor, please answer the medical questions based on the patient's description.

### input:
Hello Doctor, My tailbone has been killing me for the past few months. The pain is a heavy - pressure kind of pain. My MD had X-rays taken, this showed nothing. I saw him the other day and told him I still have this pain. He said he is not sure what else he can do for me other than use a donut when sitting. I sit at home on a nice soft leather recliner, my tailbone still kills me. I end up leaning on my side when I sit, but when I get up, the pressure/pain is terrible. I notice the pain/pressure even when I walk. Hurts when I sleep, especially turning over. I do want to mention that I had a colon resection back in 2005. I had a tumor in my rectum. The surgeon could feel my tumor, that is how low it was. I am worried I may have another tumor. PLease give me some advise what I need to do. THANK YOU FOR YOUR TIME!

### output:

Hello! I read your question and understand your concern. In my opinion the pain you have may be related to a sacral bone problem. I would like to know if you have fever or problems with the stools. These problems may be caused by a tumor infiltration the sacral and cochineal bones, by an infection of this region like an abscess or osteomyelitis, or by irritated nerves of the region from radiotherapy. Your past medical history is very concerning. You didn't mention radio or chemotherapy. So I would recommend a good physical by your GP, a full blood work for infection and a CT scan or MRI of the pelvic region to exclude these causes. Hope to have been helpful! Best wishes 