Kidney cancer is not contagious; most kidney cancers originate from malignant tumors caused by renal tubular epithelial cells. The clinical symptoms of this type of kidney cancer mainly include hematuria and abdominal masses, which may also affect kidney function. Kidney cancer is mostly not associated with any pathogens, such as bacteria or viruses, hence there are no infectious causes for kidney cancer. Currently, the medical community does not have a clear understanding of the causes, which may be related to unhealthy lifestyle habits such as smoking, as well as genetic factors, obesity, hypertension, heavy metal poisoning, and other reasons. Since there are no pathogens involved, there is no contagion.