Kidney cancer occurs when old or damaged kidney cells continue to multiply uncontrollably and form tumors. Symptoms may include blood in the urine, back pain, and swelling. Kidney cancer is staged from 1 to 4 based on tumor size and spread. The most common types are renal cell carcinoma and transitional cell carcinoma. Treatment options include surgery to remove the tumor and affected kidney(s), targeted therapy, immunotherapy, radiation therapy, and sometimes chemotherapy. The treatment approach is determined by a healthcare team and depends on the cancer's stage and type.