Relations of obesity and type 2 diabetes to urinary tract cancer were described. Occurrence of kidney cancer is more often in both obesity and type 2 diabetes. Bladder cancer has no relation to obesity but is more common in type 2 diabetic patients. Inverted relations were found in prostatic cancer. This disease is more common in obese patents but less common in type 2 diabetes. Diabetics are partly protected to this disease. Physical activity decreases the risk of kidney and bladder cancer but has no relation to bladder cancer. Urinary tract cancers have no relation to type 1 diabetes. We have found 3.9 time higher risk of kidney cancer in Czech diabetic patients.