Simple systolic hypertension is defined as a condition in which the systolic blood pressure is ≥140 mmHg and the diastolic blood pressure is <90 mmHg, which means that only the systolic blood pressure exceeds the diagnostic criteria for hypertension, while the diastolic blood pressure does not exceed the standard. Simple systolic hypertension is commonly seen in the elderly due to the sclerosis of the large blood vessels and the increase in peripheral arterial echo velocity in the elderly, which decreases the elasticity of the blood vessels and decreases the ability of the large blood vessels to regulate blood pressure. Compared with hypertension in general, simple systolic hypertension has a significant seasonal variation, with higher blood pressure in winter and lower blood pressure in summer. In addition, simple systolic hypertension is characterized by significant fluctuations in blood pressure due to changes in body position. Blood pressure is usually lower when sleeping in a flat position and when sitting. For simple systolic hypertension, it is necessary to consult a doctor in time, strictly follow the doctor's instructions for medication, do not change, reduce or stop medication without authorization.