Tinnitus is a hearing condition often described as ringing in the ears. Tinnitus can also cause other types of noise in your ears such as: buzzing, roaring, clicking, hissing and humming. The pitch heard from tinnitus can vary from a high squeal to a low roar, this can affect the patient’s ability to detect tinnitus from external sounds Tinnitus can develop gradually over time or occur suddenly. It is often associated with: age-related hearing loss, inner ear damage, earwax build-up and middle ear infection However, one in every three people with tinnitus doesn't have any obvious problem with their ears or hearing. Sources: https://www.mayoclinic.org/diseases-conditions/tinnitus/diagnosis-treatment/drc-20350162 http://www.webmd.com/a-to-z-guides/understanding-tinnitus-basics