Blood viscosity and blood pressure are directly related, and usually the higher the blood viscosity, the higher the blood pressure will appear relatively. The factors that can affect blood pressure with high blood viscosity are as follows: First, it can lead to increased peripheral resistance of blood vessels, decreased elasticity and increased brittleness of arterial walls. It also leads to hyperlipidemia secondary to these factors, all of which can cause an increase in blood pressure. Secondly, under normal circumstances, the inner lining of blood vessels is smooth and fluent, but people with high blood viscosity will gradually deposit atherosclerotic plaques under the inner lining of blood vessels, which will lead to hardening of blood vessels and decrease in elasticity, thus leading to an increase in blood pressure, which will accelerate the rupture of plaques and bleeding for a long time, leading to narrowing of the lumen, and also causing an increase in blood flow resistance, which will further lead to an increase in blood pressure. Third, when the blood viscosity increases, blood lipids will also appear relatively higher, which will further aggravate the resistance to blood flow, which will also lead to hypertension.