Normally, blood pressure is about 5 to 10 mmHg higher in winter than in summer. This is because winter temperatures are lower and peripheral blood vessels constrict when stimulated by the cold, increasing peripheral resistance and thus leading to an increase in blood pressure. The amount of blood pressure increase also varies among individuals. Therefore, for patients with hypertension, they should strictly test their blood pressure in winter, and if their blood pressure is not well controlled, they should adjust the use of antihypertensive drugs appropriately under the advice of their doctors to keep their blood pressure within a reasonable range, especially in cold areas, they should reduce outdoor activities and pay attention to keeping warm.