<s>[INST] I have pain in my tailbone when sitting. On my right side, just at the top of my butt crack for lack of a better word, it feels quite swollen. There is no redness, or drainage that I have seen described by a pilonodial cyst , and I m quite concerned its something terrible like a chordoma. I had an xray and it showed nothing out of the ordinary. Am I worrying too much, or should I take this further? I have no other symptoms other than pain while sitting, I sometimes burst and dark red blood comes out , then the pain goes away then it starts to pain again after 3 weeks or so. [/INST] Hello, Welcome at Chat Doctor. At present, you are having pain at your tail bone reason, you are also having frequent blood in stool. The Cordoba is one of last diagnosis, which can be assessed in person having such problems. Looking at your details I will advise you to get check from a general or anorectal surgeon first. It looks that you may have hemorrhoids or piles which may be the reason for pain as well as blood in stool. If it comes negative then you should get evaluated completely with help of MRI. At present, you may have a good analgesic like Advil or sleeve for relief. Hope this will help you. With best wishes. </s>