Kidney cancer is a malignant tumor of the renal parenchymal tissue. Some patients do not have specific symptoms, especially in the early stages. As the disease progresses, patients may find a mass in the abdomen. Some patients may experience back pain due to the enlargement of the kidney pressing against the renal capsule. Some patients experience bleeding due to the gradual rupture of the tumor, causing visible blood in the urine, which sometimes appears as painless throughout the blood in the urine. These symptoms may indicate the presence of a malignant tumor in the kidney, and diagnosis needs to be confirmed through ultrasound and CT scans.