Tinnitus is an irritating problem with a multitude of causes and very few remedies. It is a sound that the brain processes but the sound has no outside cause. The sound can manifest in many ways, as ringing, buzzing, humming, whistling, hissing, and more. People can experience the sound in one ear or in both. It might happen constantly or occasionally. Fortunately, there are hearing aids that offer tinnitus treatment solutions.