Tinnitus is a condition characterized by the perception of noise or ringing in the ears when there is no external sound source. People with tinnitus may experience different sounds, such as ringing, buzzing, hissing, or clicking. The sound can be constant or intermittent and may vary in intensity. While tinnitus itself is generally not a serious medical condition, it can have a significant impact on a person's quality of life, causing sleep disturbances, difficulty concentrating, and increased stress. Treatment options for tinnitus depend on the underlying cause.