what causes blood pressure to rise when standing
From Wikipedia, the free encyclopedia. Orthostatic hypertension, or postural hypertension, is a medical condition consisting of a sudden increase in blood pressure when a person stands up. Orthostatic hypertension is diagnosed by a rise in systolic blood pressure of 20 mmHg or more when standing.
Normally when you stand up, the blood tends to pool in the legs thus causing a drop in blood pressure... This drop in blood pressure is picked up by the baro receptors which in turn activate certain reflex mechanism to maintain the blood pressure within normal ranges.