Usually, the outside temperature has some influence on human blood pressure, such as winter blood pressure is a little higher than summer blood pressure, there may be a difference of 3-15 mmHg. In winter, the temperature is lower, in the low temperature environment, the human body’s skin and blood vessels are easy to contract, so that the blood flow rate of blood vessels slows down, the blood vessel volume increases, so that the blood pressure has risen. In winter, when the body is exposed to sudden cold, or stimulated by alternating heat and cold, the blood pressure may rise erratically, but the rise is generally no more than 15 mmHg. Depending on the individual’s physical condition, the difference in blood pressure between winter and summer may vary. Typically, winter blood pressure may be 3-5 mm Hg higher than summer blood pressure in people without hypertension and 5-15 mm Hg higher than summer blood pressure in people with hypertension. If the difference in blood pressure between winter and summer is more than 15 mmHg and cannot be recovered through self-regulation, it should be considered whether cardiovascular or cerebrovascular disease is present, and should be examined in a timely manner in a hospital to make a clear diagnosis and carry out antihypertensive treatment as soon as possible.