<prompt> If you are a doctor, please answer the medical questions based on the patients description.Doctor, I have been having vomiting, low back pain, decreased appetite, back pain, and blood in my urine. What could be the reason for these symptoms?  <response>: Based on your symptoms, it sounds like you may have a benign kidney cyst, which is a fluid-filled sac that can form on your kidney causing pain and discomfort, as well as nausea and blood in your urine. 