With the recent sudden cold weather, the number of middle-aged and elderly people coming to the hospital with significantly higher blood pressure is rapidly increasing. For example, the Department of Cardiology of the West Hospital of Peking Union Medical College has admitted a number of patients with hypertension around 40 years old in the past week, who usually do not know they have hypertension and do not pay attention to blood pressure measurement, but now have dizziness and headache and find that their blood pressure is above 200/110mmHg. It is good that these patients received timely treatment and their blood pressure was controlled sooner to avoid complications such as stroke. Why does blood pressure rise in cold weather? The main reason is the following: First, the cold stimulates vasoconstriction. “Heat expansion and cold contraction” is the truth that we all understand, cold stimulates the blood vessels will contract, the blood vessels contract with force, blood pressure will come up. Second, cold days, sweating is reduced, the relative reduction of salt and water discharged from the skin; in addition, the appetite increases when it is cold, salt and other intake increases, the result is more salt and water in the human body than in the summer and make blood pressure rise. Third, when the weather changes, easy to catch a cold, poor health and even pneumonia, with cold medicine and these diseases themselves will also raise blood pressure. Therefore, when the weather becomes cold, especially the middle-aged and elderly friends must pay attention to their blood pressure! And pay special attention to these aspects: 1. To regular medical checkups and regular blood pressure measurement. If there is no hypertension, middle-aged and elderly friends at least annual physical examination to measure blood pressure, in addition to the weather turns cold, should also measure blood pressure, in case the cold has made blood pressure rise to high values; if there is hypertension, blood pressure should be measured regularly, it is best to buy their own electronic sphygmomanometer to measure their own, the daily morning, morning and afternoon, late when the blood pressure at four points in time to do a good record, in order to find the pattern of changes in blood pressure to adjust the timing of medication, but also Helpful to exclude white coat hypertension. 2, to adhere to the medication, appropriate adjustment program. Hypertension even if there are no symptoms should also adhere to treatment, the weather becomes cold when the blood pressure generally increases, regardless of whether there is no discomfort at this time, it is best to go to the hospital, adjust the antihypertensive drug treatment program, do not wait until there are symptoms and then go, it is not allowed to have a stroke. 3, pay attention to the cold to keep warm and prevent colds. Specifically, this includes the following: move your body in the bedding before getting up for breakfast and get out of bed after the air in the room has warmed up; use warm water when washing your face and brushing your teeth; remember to add more clothes when you go out; do small movements such as stepping in place when waiting outside; let the air in the bathroom warm up before bathing. 4, control the diet, pay special attention not to be too salty, control the intake of protein and fat, increase vegetables and fruits, etc.