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Kidney cancer may not cause any signs or symptoms in its early stages. This is because the kidneys have few nerves, so tumours can grow without causing any pain or discomfort. The kidneys are also deep inside the body, which means that tumours have space to grow very large before they affect other organs. People often start to have symptoms once the tumour grows into surrounding tissues and organs.
Up to one-third of people with kidney tumours are diagnosed when they don’t have any signs or symptoms. In these cases, the kidney tumour is found on an ultrasound or x-ray done for another reason. Because kidney tumours don’t cause symptoms until they are large, most people with kidney cancer have advanced disease when it is diagnosed.
Other health conditions can cause the same symptoms as kidney cancer. See your doctor if you have these symptoms:
Symptoms of paraneoplastic syndrome include: