You have two kidneys. They are fist-sized organs on either side of your backbone above your waist. The tubes inside filter and clean your blood, taking out waste products and making urine.

Kidney cancer forms in the lining of tiny tubes inside your kidneys. It happens most often in people over 40.

Risk factors include smoking, having certain genetic conditions and misusing pain medicines for a long time.

Often, kidney cancer doesn't have early symptoms. However, see your health care provider if you notice

1. Blood in your urine
2. A lump in your abdomen
3. Unexplained weight loss
4. Pain in your side
5. Loss of appetite