Kidney cancer and uremia are two completely different concepts. Kidney cancer refers to the presence of a malignant tumor, which is a malignant lesion in kidney-type tissues. Certain cells in the kidney are in a state of limitless proliferation, continuously replicating to form kidney-like masses, and may cause hematuria, or even squeeze kidney tissues affecting their function. Uremia, on the other hand, refers to long-term chronic damage to the kidneys from various diseases, leading to the destruction of over 90% of kidney tissue, rendering the kidneys unable to excrete metabolic waste. This results in azotemia, electrolyte disorders, and other complications, a state known as uremia. Patients with kidney cancer, if the damage to kidney tissues is not severe, may still have normal kidney function. However, if severe problems occur in both kidneys, kidney cancer could also lead to uremia, although this situation is relatively rare.