The hissing in the ear you reported might be related to stenosis (narrowing) of the artery responsible for supplying the inner ear with blood. It might be one of the first signs of atherosclerosis. Atherosclerosis is a condition in which atherosclerosis plaques are formed on the walls of the blood vessels. The plaques are formed of lipids and calcium. The lipids are actually the excess of lipids taken with food and absorbed in the blood.
Where the plaques would form cannot be determined for sure. But the narrowing they form might be insufficient for the blood supply needed for the specific organ. For example, plaques in the coronary (heart) arteries might cause a heart attack when other specific conditions are met.
You might want to visit your family doctor for a physical examination and laboratory tests. You might want to keep your lipids low. You might be referred to an Ear, Nose and Throat specialist for further examination and to confirm or to rule out other possible causes for that hissing sensation in the ear.
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