Orthostatic hypotension

    Orthostatic hypotension, also known as postural hypotension, orthostasis, and colloquially as blood rush or dizzy spell, is a form of hypotension in which a person’s blood pressure suddenly falls when standing up or stretching. Medically it is defined as a fall in systolic blood pressure of at least 20mm Hg and diastolic blood pressure of at least 10 mm Hg when a person assumes a standing position. The symptom is caused by blood pooling in the lower extremities upon a change in body position.

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