More. 1  Oxygen Levels and Brain Function The brain consumes about 25 percent of a personâs oxygen intake, so proper brain function requires enough blood oxygen. 2  How Oxygen Affects the Heart The heart is a key player in making sure oxygenated blood travels to the organs and tissues that need it.
Other possible kidney cancer symptoms may include: 1  Persistent pain in the side of the abdomen or the back, which is not the result of an injury. 2  A mass or lump in the abdomen. 3  Feeling fatigued.  Unexplained, sometimes rapid, weight 1  loss. A fever that is not due to an illness.
Symptoms of renal cell cancer may include the following: 1  Hematuria (blood in the urine). 2  Pain in the flank (side or back above the waist) that will not go away. 3  Noticeable mass (lump) in the flank. 4  Weight loss. 5  Fatigue (feeling tired). 6  Loss of appetite. 7  Fevers. 8  Night sweats. 9  Malaise (feeling blah).