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Possible causes of hypotension include: Orthostatic or postural hypotension In combination with the effects of neurological and hormonal factors, these mechanisms determine the extent to which blood pressure will be high or low. However, it is generally better to have persistently low blood pressure than high blood pressure, as it poses a lower risk of various health problems.īlood pressure depends on two main mechanisms: the functioning of the heart and the resistance of the blood vessels.
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It can be life threatening if oxygen and nutrients are unable to reach the brain, heart, and other vital organs. Very low blood pressure can be a sign of an allergic reaction or internal bleeding. An adult with low blood pressure will have a reading of less than 90/60 millimeters of mercury (mm Hg).Īccording to the American Heart Association (AHA), doctors do not usually consider low blood pressure a problem unless it causes noticeable signs and symptoms. The top number shows the systolic pressure, which is the pressure when the heart is contracting, and the bottom number gives the diastolic pressure, which is the pressure between heartbeats. It is less likely than high blood pressure to be problematic, but it can sometimes indicate an underlying health issue.īlood pressure readings include two numbers.
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