Tinnitus is defined as a phantom auditory perception. This indicates a noise that somebody hears inside his ears or head when that noise doesn't exist externally. It is also known as ear ringing, ringing in the ears, and head noises. The word tinnitus is derived from the Latin word 'tinnire'' which indicates "ringing." It is estimated that involving 10% and 20% of adults more than the age of 50 practical experience tinnitus. Of these, about 25% report that they suffer. Suffering means that the noise in their ears or head interferes with their typical activities, like sleep, the ability to concentrate, mood alterations, the ability to perform their usual activities. The remaining 75% progressively develop a habit of consciously ignoring their noise to ensure that it doesn't interfere with their lives. This habit state is identified as habituation.