Kidney cancer can be detected through routine physical examination, which includes kidney ultrasound and urine routine examination. Early stage kidney cancer can be detected by ultrasound with a mass larger than 5mm, but if the mass is smaller than 5mm, it may not be detected by ultrasound, and it can be further combined with urine routine examination to judge the possibility of kidney cancer. Kidney cancer may be combined with hematuria, which may show positive occult blood or red blood cell count exceeding the standard in routine urine examination, and then it can be further combined with ultrasound examination to judge that there may be kidney cancer. However, to confirm the diagnosis, enhanced CT scan of the kidney is needed to clarify whether there are malignant lesions in the kidney, and renal puncture biopsy is needed to confirm the diagnosis if necessary. Through routine physical examination, patients can be screened out whether there are malignant lesions in the kidneys, but the diagnosis needs to be confirmed by other detailed examinations to achieve the final characterization.