Should a person with renal vein cancer have agitated stomach problems? My uncle, a 51 yr. old man has been waiting for surgery to remove his kidney. With in the last two months or so he has had nausea, stomach aches, and vomiting. I have the belief that it is his stress that is causing this, but before i jump to conclusions, is it possible that his problems are due to the cancer? Could this mean it is spreading? Or could it simply be nothing?