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 kidney cancer. Symptoms of kidney cancer. Kidney cancer often doesnât cause symptoms until the tumor has already grown. The most common symptom of kidney cancer is blood in the urine, or hematuria. If the amount of blood is too small to see with the naked eye, your doctor can find it on a urine test.