I've been having left flank pain and blood in my urine for months, recently I've developed loss of appetite, nausea and vomiting.  Everyone I've seen so far has said kidney stones or kidney infection, but ultrasound, CT scan and blood work always come back normal. I have an appointment with a urologist this week but after reading the posts here I'm not confident they'll find out what it is. The pain is a constant ache but recently has become stronger. OTC drugs don't touch it, so I'm taking opioids but worry about becoming addicted. From what I've read, these are also symptoms of renal cancer.