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Vital signs. 1  High temperature, increased heart rate, decreased blood pressure, and faster breathing are signs of potential dehydration and other illnesses. 2  Taking the pulse and blood pressure while the person is lying down and then after standing up for one minute can help determine the degree of dehydration.
Dehydration (de-hi-DRA-shun) is the most common cause of orthostatic hypotension. Dehydration occurs if the body loses more water than it takes in. You may become dehydrated if you don't drink enough fluids or if you sweat a lot during physical activity. Fever, vomiting, and severe diarrhea also can cause dehydration. Orthostatic hypotension also may occur during pregnancy, but it usually goes away after birth. Because an older body doesn't manage changes in blood pressure as well as a younger body, getting older also can lead to this type of hypotension.