Tinnitus is the hearing as any sensation of sound in the absence of any external stimulation. What does tinnitus sound like? Most people describe it as a ringing, buzzing, or pulsating sensation in the ears, and can happen in the right or left ear. A sure sign of Tinnitus is when you hear a ringing sound, but no one else can hear it (the ringing sound does not come from your surroundings). When you hear the sound, it may keep pace with your breathing or seem to keep time with the beating of your heart.