Why does blood pressure rise in cold weather? The main reason is the following: First, the cold stimulates blood vessel contraction. “Heat expansion and cold contraction” is the truth that we all understand, the cold stimulates the blood vessels will contract, the blood vessels contract with force, blood pressure will come up. The second is the cold day sweat to reduce the salt and water discharged from the skin; in addition, the appetite increases when it is cold, the intake of salt and other increased, the result is that the body of salt and water more than the summer and make blood pressure rise. Third, the weather changes when 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, everyone, especially the middle-aged and elderly friends must pay attention to their blood pressure! And in the following aspects to pay special attention to these: 1, to regular medical checkups, 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, evening four points of time blood pressure to do a good record, in order to find the pattern of changes in blood pressure to adjust the timing of medication, but also conducive 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 increased, 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 you get up for breakfast and get out of bed after the room air has warmed up; use warm water when washing your face and brushing your teeth; remember to add more clothes when you go out; make small movements such as stepping in place when waiting outside; and let the air in the bathroom warm up before bathing. 4. Control your diet. Pay special attention not to be too salty, control the intake of protein and fat, increase vegetables and fruits, etc.