Acoustic neuroma can cause continuous high-pitched ringing in one ear. The American Tinnitus Association estimates that nearly one in six Americans suffer from tinnitus. We choose hearing aids for patients based upon what the patient needs, not on incentives from manufacturers. It is caused by abnormal nerve signals that compensate for missing input. Yet, only 10% of those individuals seek medical attention. If you are on Medicaid or qualify for free or reduced lunch at school, the rate is reduced to $150. A doctor can help you rule out possible causes of tinnitus.