blood pressure – MySymptom

What Causes a Sudden Drop in Blood Pressure When Standing Up Quickly?

1. Introduction A sudden drop in blood pressure when standing up quickly is primarily caused by orthostatic hypotension, a condition where the autonomic nervous system fails to immediately compensate for the gravitational pull of blood into the lower extremities. When transitioning from a seated or lying position to a standing one, roughly half a liter … Read more

What causes a sudden spike in blood pressure at night?

1. Introduction A sudden spike in blood pressure at night is primarily caused by obstructive sleep apnea, underlying renal dysfunction, or autonomic nervous system dysregulation. Normally, blood pressure drops significantly during sleep, but disrupted airway mechanics or endocrine anomalies trigger sympathetic activation, driving the vascular resistance and pressure upward. Comprehensive clinical evaluation, including ambulatory blood … Read more