When you get up from the bed in the morning, do you hear a hiss within your head (or in the ears)? Do you feel like you'll faint?
It can mean that you have a low blood pressure (BP).
In healthy adults BP is between 140/90 and 90/50 mm Hg. Normal BP level varies from person to person, so more than absolute value the change of BP level is important. Fall of BP for 20mmHg in a short time can cause hypotension symptoms even if the absolute value of BP is within normal range.
How low BP causes a hiss?
Low BP leads to low pressure within the head (intracranial pressure) consequently changing the pressure in an ear cohlea fluid (endolymph), which affects the normal way of stimulation of hearing receptors what results in a hiss. In addition: blood supply to inner ear vessels is not sufficient what results in inappropriate operation of the inner ear.
Other causes of hiss related to vessels/blood:
High blood pressure
Atherosclerotic artery or thrombotic plug in veins near the ear causing turbulent blood flow.
Brain artery aneurysm
Changes in blood composition (anemia, leukemia...)
Dehydration
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