First of all, the reason is because the blood cell concentration is too high, the number of cells in the blood of the relative increase. For example, the water content in the elderly is relatively reduced, and the water content in the blood is also reduced. Then the proportion of blood cells will increase. Due to the decrease of the liquid components in the blood and the increase of solid components, the viscosity of the blood will naturally increase.
Secondly, want to know is not suffering from the blood, you can choose to go to the hospital to do a rheology examination, the examination referred to as blood rheology, it actually can be simulated by in vitro blood flow, so as to judge the state of blood coagulation and thrombus formation to predict the future.