What Happens If You Have Too Many Red Blood Cells?

spanteldotru/E+/Getty Images

Health Hype states that an excess amount of red blood cells affects the viscosity of blood and causes the rate of blood flow to decrease. While the body copes with a slight increase or decrease in the red blood cell concentration within the blood, too many red blood cells or too few red blood cells have a plethora of effects on the human body.