Patients with hypertension usually have high blood pressure in winter and low blood pressure in summer. This is because human blood vessels are elastic, and according to the principle of thermal expansion and contraction, the skin blood vessels expand and blood flow increases in the hot summer environment, and blood flow decreases due to sweating in summer, and all these factors lead to low blood pressure in summer. While the cold weather in winter skin vasoconstriction, peripheral vascular resistance increases, exercise is reduced, sweating is less, blood flow is relatively increased, these factors will lead to high blood pressure in winter. Therefore, for patients with hypertension, it is important to closely monitor blood pressure levels and adjust the dose of hypertension medication according to blood pressure to keep blood pressure levels stable and reduce the occurrence of cardiovascular and cerebrovascular diseases.