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.
The exact cause of kidney cancer is unknown, but certain risk factors are linked to the disease (a risk factor is anything that increases a person's chance of getting a disease). Different cancers have different risk factors.Some risk factors are under your control (smoking); others are not (gender and race).n the early stages, renal cell cancer usually causes no clear signs or symptoms. However, as the tumor grows, symptoms may include: 1  Blood in the urine (hematuria). 2  A lump or mass in the area of the back near the kidneys.