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Definition
By Mayo Clinic staffLow blood pressure, also called hypotension, would seem to be something to strive for. However, for many people, low blood pressure can cause symptoms of dizziness and fainting or mean that they have serious heart, endocrine or neurological disorders. Severely low blood pressure can deprive the brain and other vital organs of oxygen and nutrients, leading to a life-threatening condition called shock.
Although blood pressure varies from person to person, a blood pressure reading of 90 millimeters of mercury (mm Hg) or less systolic blood pressure (the top number in a blood pressure reading) or 60 mm Hg or less diastolic blood pressure (the bottom number) is generally considered low blood pressure.
The causes of low blood pressure can range from dehydration to problems with the way your brain signals your heart to pump blood. Low blood pressure is treatable, but it's important to find out what's causing your condition so that it can be properly treated.
- Your high blood pressure questions answered: Low blood pressure. American Heart Association. http://www.americanheart.org/presenter.jhtml?identifier=3034848. Accessed April 14, 2009.
- Hypotension. National Heart, Lung, and Blood Institute. http://www.nhlbi.nih.gov/health/dci/Diseases/hyp/hyp_whatis.html. Accessed April 14, 2009.
- Sheps SG, ed. Mayo Clinic 5 Steps to Controlling High Blood Pressure. Rochester, Minn.: Mayo Foundation for Medical Education and Research; 2008.
- Kaufmann H, et al. Mechanisms and causes of orthostatic and postprandial hypotension. http://www.uptodate.com/home/index.html. Accessed April 6, 2009.
- Kaufmann H, et al. Treatment of orthostatic and postprandial hypotension. http://www.uptodate.com/home/index.html. Accessed April 6, 2009.
