 [ Symptoms ] i have had idiopathic intracranial hypertension now lose vision doctors do not know why [ Disease ] do you also get a little lightheaded during these episodes if so you are probably experiencing a bit of orthostatic hypotension which is a fancy term that means your blood pressure drops a bit when you stand up this can happen because gravity pulls blood down into your legs when you stand and it takes the body a moment to get that blood redistributed back up to the brain again even if you are not experiencing lightheadedness what you are hearing likely is the blood being pumped north after it is been pulled south when you stand up that whooshing you hear is the heart and baroreceptors working quickly to pump blood upstairs if this has started recently you might want to consider drinking more water orthostatic hypotension is by definition an issue of low blood pressure by increasing your water intake you will increase the overall volume in your blood vessels and possibly avoid the symptoms you describe orthostatic hypotension in and of itself usually is not dangerous but if you begin fainting or having trouble with balance then it is time to call the doctor because your symptoms could indicate some underlying problem i hope this helps