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Blood pressure is the measurement of the force of blood pushing 
against the walls of the arteries. Arterial blood pressure is 
constantly fluctuating during the course of the cardiac cycle. The 
highest pressure in the cycle is called the systolic blood pressure, 
and represents the pressure in the artery when the heart is beating. 
The lowest pressure is the diastolic blood pressure, and represents 
the pressure in the artery when the heart is at rest. Both the 
systolic and the diastolic pressure are necessary for a physician to 
evaluate the status of a patient's blood pressure. 
Many factors such as physical activity, anxiety or the time of day, 
can influence your blood pressure. Blood pressure is typically low 
in the mornings and increases from the afternoon to the evening. 
It is on average lower in the summer and higher in the winter.
Having one's blood pressure measured by a doctor in a hospital 
or a clinic, is often associated with a phenomenon called “White 
Coat Hypertension” where the patient becomes nervous or 
anxious, thus raising his blood pressure. There are also numerous 
other factors that might cause your blood pressure to be raised 
Why is it useful to measure blood pressure at home? 
What is blood pressure?
About Blood Pressure