The difference between kidney cancer and bladder cancer is not great. Kidney cancer can be accompanied by blood clots in the process of bleeding because the bleeding will drain into the bladder through the ureter, so the blood clots are in the form of cords or worms. In bladder cancer, after bleeding, the blood and urine will be completely collected in the bladder, and the blood clot may be formed after a long time, but it will not be formed in the form of cords or earthworm-shaped blood clots. For example, back pain with hematuria is more likely to be associated with kidney cancer, while pain in the small abdomen with hematuria or painless hematuria of the naked eye is more likely to be associated with hematuria of bladder cancer, but it is not specific. The duration of hematuria can also be judged from the duration of hematuria. Generally, the bleeding caused by kidney cancer is relatively short and intermittent, while the bleeding caused by bladder cancer is mostly persistent, but it is not specific.