Stage 1 kidney cancer may not actually cause any symptoms. Because the tumor is generally still small and hasn't yet spread elsewhere in the body, stage 1 kidney cancer can sometimes go unnoticed. Often, kidney cancer may not cause noticeable symptoms until the disease has progressed. The first symptom of stage 1 kidney cancer that people generally notice is blood in their urine, which may cause urine to turn pink, brown, or red. Another common early symptom is a pain in your side, right below the ribs. Sometimes, stage 1 kidney cancer may cause a lump in your abdomen that can be felt from the outside, although this generally doesn't happen till later stages when the tumor grows large enough to be felt. As the cancer progresses, other symptoms like weight loss, fever, and fatigue may occur.