I have been having this burning sensation near my appendix area since last night. It's constant and does not go away or dull down. I have PCOS and Endometriosis. Last year my endometriosis spread up to my liver damaging it. I'm unsure if it could be my endometriosis spreading again since I've been getting random liver damage and do not take Tylenol or drink, or if it could be a new issue.