Low blood pressure refers to diastolic blood pressure, and its high level may be due to accelerated heart rate, increased peripheral resistance, and decreased elasticity of blood vessel walls. 1. Accelerated heart rate: prolonged stress, use of alcohol and other factors may lead to accelerated heart rate and shorter systole of the heart, which leads to high diastolic blood pressure, and reduced blood flow from the aorta to the whole body, which further leads to increased diastolic blood pressure. 2. Increased peripheral resistance: high blood lipids and increased blood viscosity lead to slower blood flow, which in turn leads to prolonged pressure of blood on blood vessel walls, thus leading to high diastolic blood pressure. 3. Weakened elasticity of blood vessel wall: blood pressure is generated by the pressure of blood on the blood vessel wall, such as atherosclerosis and other causes of weakened elasticity of the blood vessel wall, resulting in the contraction of the blood vessel wall is not obvious, which may lead to high diastolic blood pressure. If high diastolic blood pressure occurs, you should seek medical treatment promptly.