Kidney cancer itself generally does not cause fever. Kidney cancer is a malignant tumor, and the most common clinical manifestation in patients is hematuria. As this malignant tumor grows larger, it may eventually rupture and bleed, leading patients to notice the formation of blood in the urine. Some patients may also be able to feel a mass in the abdomen. In severe cases of kidney cancer, it may lead to reduced urine output due to kidney failure. These symptoms are common manifestations of kidney cancer. Kidney cancer itself is unlikely to cause a fever, but due to the presence of kidney cancer, changes in the tissue structure of the kidney can occur, making infections more likely. When an infection occurs, it may also cause a fever, but this fever is not directly caused by the kidney cancer itself.