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Why does blood pressure drop in summer?

Views: 0     Author: Site Editor     Publish Time: 2022-07-26      Origin: Site


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Sweating in hot weather


In summer, when the temperature rises, the dominant evaporation (sweat) and recessive evaporation (invisible water) of human fluid increase, and the blood volume of blood circulation decreases relatively, which will lead to the decrease of blood pressure.


Hot weather stimulates blood vessels


We all know the principle of heat expansion and cold contraction. Our blood vessels will also expand and contract with heat. When the weather is hot, the blood vessels will expand, the blood circulation will accelerate, and the lateral pressure of blood flow on the blood vessel wall will be reduced, thus reducing the blood pressure.


Therefore, blood pressure has been relatively reduced, and patients with hypertension are still taking as same dose drugs as in winter, which is easy to lead to low blood pressure.


Is low blood pressure a good thing in summer?


Don't think that the sudden drop in blood pressure in summer is a good thing, because the drop in blood pressure caused by weather is only a symptom, and the blood pressure is sometimes high or low, which belongs to more dangerous blood pressure fluctuations. People with high blood pressure are prone to hypertensive diseases such as cerebral thrombosis, coronary heart disease, myocardial infarction, etc., but when blood pressure is too low, it will cause insufficient blood supply to the brain, weakness of the whole body, and even lead to the attack of cerebral infarction or angina pectoris.


Regular pressure measurement is key!

 blood pressure monitoring

Does hypertensive summer medication need adjustment? The first is to measure blood pressure regularly and understand the changes of your blood pressure.


When summer comes, especially when the temperature rises significantly, the frequency of blood pressure measurement can be appropriately increased.


In addition, pay special attention to the following points when measuring blood pressure:


  1. Human blood pressure shows "two peaks and one valley" in 24 hours. Generally speaking, the two peaks are between 9:00 ~ 11:00 and 16:00 ~ 18:00. Therefore, it is recommended to measure twice a day, that is, once in the morning and once in the afternoon during the peak period of blood pressure.


  1. Pay attention to the same time point and body position when measuring blood pressure every day; At the same time, pay attention to being in a relatively quiet state, and do not take blood pressure immediately after going out or coming back after eating.


  1. In case of unstable blood pressure, blood pressure should be measured four times in the morning, around 10 a.m., in the afternoon or evening and before going to bed.


  1. Generally, the blood pressure should be measured continuously for 5 ~ 7 days before adjustment, and records should be made according to the time point, and continuous comparison can be made to determine whether the blood pressure does fluctuate.


According to the blood pressure data you measured, the doctor will judge whether you need to adjust the drugs. We strive to reach the standard of blood pressure as soon as possible, but it is not equal to rapid blood pressure reduction, but moderate and stable adjustment of blood pressure to the standard range within weeks or even months.


Prevent excessive blood pressure fluctuations!


To maintain an ideal blood pressure condition, we cannot do without good living habits. Pay special attention to the following points:


Sufficient moisture


Sweating is more in summer. If you don't supplement water in time, it will reduce the fluid volume in the body and cause blood pressure fluctuations.


Therefore, you should avoid going out from noon to 3 or 4 o'clock, take water with you or drink water nearby, and don't drink water only when you feel thirsty obviously.


Good sleep


In summer, the weather is hot, and it is easy to be bitten by mosquitoes, so it is easy to sleep well. For people with hypertension, poor rest is easy to cause blood pressure fluctuations, increase the difficulty of blood pressure control or cause the onset of cardiovascular and cerebrovascular diseases.


Therefore, good sleep habits and a suitable sleep environment are very important to maintain the stability of blood pressure.


Suitable temperature


In summer, the temperature is high, and many elderly people are not sensitive to heat. They often don't feel heat in high-temperature rooms, which leads to asymptomatic blood pressure fluctuations and even attacks of cardiovascular and cerebrovascular diseases.


There are also some young people who like to adjust the indoor temperature to be particularly low, and the outdoor temperature is hot. Situation of both cold and hot is also easy to cause the contraction or relaxation of blood vessels, resulting in large fluctuations in blood pressure, and even accidents.


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