Your kidneys are two bean-shaped organs, each about the size of your fist. They’re located behind your abdominal organs, one on each side of your spine. Like other major organs in the body, the kidneys can sometimes develop cancer.
In adults, the most common type of kidney cancer is renal cell carcinoma, which begins in the cells that line the small tubes within your kidneys.
The American Cancer Society estimates that almost 51,000 people in the United States are diagnosed with kidney cancer each year. The incidence of kidney cancer seems to be increasing, though it isn’t clear why. Many kidney cancers are detected during procedures for other diseases or conditions. Imaging techniques, such as computerized tomography (CT), are being used more often, which may help find more kidney cancers.