Simple systolic hypertension is defined as systolic blood pressure ≥140 mmHg and diastolic blood pressure <90 mmHg, where systolic blood pressure is increased but diastolic blood pressure is not. Simple systolic hypertension is the most common type of hypertension in the elderly, and its incidence increases with age. The cause of simple systolic hypertension is the decrease of elastic fibers in the blood vessel wall with age, the elasticity of the blood vessel decreases, and the ability of the large blood vessels to regulate blood pressure decreases, which is manifested as simple systolic hypertension. The main characteristic of simple systolic hypertension is that systolic blood pressure increases while diastolic blood pressure does not, followed by excessive fluctuation of blood pressure, which will fluctuate more significantly with changes in body position. For example, the systolic blood pressure will be slightly lower when sleeping and sitting, and slightly higher when waking up and lying down. In addition, some patients also experience large fluctuations in blood pressure with seasonal changes, with higher blood pressure in winter and lower blood pressure in summer. Patients with high systolic blood pressure alone should be controlled with antihypertensive medication under the guidance of a doctor, and the fluctuation of blood pressure should be closely observed and the dose and duration of medication should be adjusted according to the doctor's instructions.