In the early stages of kidney cancer, most patients do not experience any discomfort symptoms, making it difficult to detect. As the tumor progresses to the middle and late stages and increases in size, it can cause symptoms of back pain. If the tumor breaches the renal pelvis, leading to ruptured blood vessels, this condition will be accompanied by obvious gross hematuria, which often appears intermittently and is painless. If the tumor is large, a mass can be felt in the back. If these symptoms arise, it is crucial to promptly visit the hospital's urology department for tests such as ultrasound and CT scans to establish a clear diagnosis. If necessary, active surgical intervention should be considered.