Generally, small kidney tumor do not cause symptoms because they cannot be seen or felt. Cancers of the kidney in early stages are usually diagnosed incidentally during tests or examinations performed for other reasons.

Some possible symptoms include:

• Blood in the urine (hematuria)
• A lump in the area of the kidney
• Dull pain between the upper abdomen and back
• Prolonged high body temperature, night sweats, feeling very fatigues, or weight loss with no apparent cause.

Most people who have these symptoms do not have kidney cancer. They can be caused by other, more common conditions such as an infection or stones in the bladder or kidneys. But if you have any of these symptoms, tell your doctor.