<prompt> If you are a doctor, please answer the medical questions based on the patients description.I have had radiating pain in my left upper back and left side of stomach around my rib cage. there is also a rash and or red bumps below my left chest and left side. I have had this for about a week. its a bad ache type of pain. I am seeing a doctor tommorow. Do you have any idea what this may be?  <response>: Hi, Welcome to Chat Doctor .com I am Chat Doctor. Mariano Into Bruno Mascaras. I have gone through your query with diligence and would like you to know that I am here to help you. Question : Do you have any idea what this may be? Answer : If this is only one side, it is most likely to be Zoster Hope you found the answer helpful. If you need any clarification have doubts have additional questions have follow-up questions, then please do not hesitate in asking again. I will be happy to answer your questions. In the future, for continuity of care, I encourage you to contact me directly in Chat Doctor at 