The average blood pressure in winter is higher than the average blood pressure in summer, is a relatively common phenomenon, the main reasons are: 1, the winter weather is cold, the peripheral skin blood vessels belong to the state of contraction, sweating will also be correspondingly reduced. Of course, at the same time, the blood vessels will contract, and the blood flow of the kidneys will be relatively reduced after the contraction of the blood vessels, so urination is also reduced, so the overall blood volume in the human body in winter is relatively more than in summer; 2, the cold weather in winter, the arteries of the whole body also belong to the contracted state, the contracted state will lead to increased vascular resistance. Blood pressure is related to blood volume and vascular resistance, and these two factors are related. Therefore, when the vascular resistance increases, blood pressure is bound to be higher. So with the influence of these factors, our blood pressure is generally a little higher in winter than in summer. Therefore, patients with hypertension or cardiovascular diseases should pay extra attention to keep warm and cold in winter. In addition, the medication must be standardized and taken regularly.