Blood pressure is the force exerted by circulating blood on the walls of blood vessels. It constitutes one of the critically important signs of life or vital signs which include heart beat, breathing, and temperature. Blood pressure is generated by the heart pumping blood into the arteries modified by the response of the arteries to the flow of blood.
Anyone can occasionally get a sudden drop in blood pressure that causes symptoms, such as fainting. A number of factors can cause this, such as standing for a long time in a hot environment, pain and strong emotions. These usually cause only a brief, temporary drop in blood pressure.


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