The kidneys are two bean-shaped organs lying in the lower abdomen. They remove the waste products from the body. Kidney cancer is a disease where the cells of the kidney turn cancerous and grow out of control. It is also called as renal cancer. The exact cause of is unknown, but there are numerous risk factors such as smoking, drinking alcohol, obesity, high blood pressure, etc. Signs and Symptoms of Kidney Cancer There may be no symptoms in the early stages of kidney cancer. However, as the tumor grows, the following symptoms start appearing: Lump on one side of the abdomen Loss of appetite Blood in urine Unexplained weight loss Persistent pain on one side of the abdomen Anemia Extreme fatigue Unexplained fever Swelling in the legs As the cancer spreads to the other parts of the body, other symptoms that set in are: Extreme pain in the bones Coughing up blood Breathlessness Causes and Risk Factors of Kidney Cancer Generally, kidney cancer affects people a