Kidney cancer is a common malignant tumor in the urinary system. Many patients with early-stage kidney cancer do not show any symptoms clinically and are incidentally discovered during medical examinations. Many patients in the early stages may also present with painless hematuria, sometimes as gross hematuria and sometimes as microscopic hematuria. Some patients may experience pain in the kidney area due to blood clots formed after hematuria, mainly presenting as intermittent episodes of mild back pain. Additionally, some patients in the early stages might show symptoms of paraneoplastic syndrome, such as hypertension and fever, but these clinical symptoms generally occur at a very low frequency. When patients present with obvious clinical symptoms, it often indicates that the kidney cancer has metastasized, leading to a clinical presentation of mid-to-late stage kidney cancer.