What are the symptoms of stage 4 kidney cancer?

A common symptom of stage 4 kidney cancer is often bloody urine, which may cause urine to look red, pink, or brown. Another symptom of stage 4 kidney cancer may be persistent pain in the lower back, right below the ribs. Sometimes, the tumor caused by stage 4 kidney cancer can cause a lump in your abdomen that can be felt from the outside. Other symptoms of stage 4 kidney cancer may include weight loss, fever, and fatigue.