The causes of low diastolic blood pressure in the elderly can be generally divided into physiological and pathological, physiological due to the hardening of the blood vessel wall, decreased elasticity and pathologic diseases are common aortic valve closure insufficiency, arterial catheterization and other organic heart diseases. 1. Physiological: diastolic blood pressure is lower than 60mmHg, i.e. low diastolic blood pressure, the maintenance of diastolic blood pressure relies on the elasticity of the aorta, the wall of the blood vessel of the elderly is sclerotic, the elasticity of the retraction ability also decreases, the ability of the aorta to store blood decreases in the diastolic phase, so it shows as a decrease in diastolic blood pressure. 2. Pathological: lower diastolic blood pressure in the elderly is often seen in organic heart disease, such as aortic valve insufficiency, arterial catheterization, etc., because of the increase of blood returning to the left ventricle during diastole, which will cause the diastolic blood pressure to fall and systolic blood pressure to increase. 3. Others: malnutritional anemia in the elderly can also lead to low diastolic blood pressure. If the diastolic blood pressure is lower than 60mmHg, it is recommended to go to the cardiology department of the hospital in time to find out the cause.