The specific causes of hypertension low pressure are as follows: 1. Physiological lowering, common in the elderly, because atherosclerosis leads to a lower diastolic pressure, and blood pressure diastolic pressure to maintain to aortic contraction. If the aortic calcification is very serious, the contraction will be weakened, diastolic blood pressure will drop significantly, resulting in an increase in pulse pressure difference. The treatment of this part of the patient is more special, with antihypertensive drugs in addition to taking into account the systolic pressure, but also take into account the diastolic pressure, diastolic pressure can not be reduced too low; 2, some patients have organic diseases, can also lead to very high systolic pressure, diastolic pressure is very low, such as aortic valve closure insufficiency, and hyperthyroidism, the above two diseases will lead to a significant increase in pulse pressure. If the patient has such a condition, it is recommended to first improve the cardiac ultrasound, thyroid function tests to exclude the above-mentioned aspects of the disease.