Ringing in the ears, also known as tinnitus, is characterized by noises like hissing, whistling, buzzing or clicking that seem to originate from inside the ear or head. It can be caused by ear injuries, age-related hearing loss, circulatory system problems, high blood pressure, migraine, and excess caffeine or alcohol consumption. While usually not dangerous, tinnitus can cause annoyance and problems with focus, sleep, mood, and attention. Treatment options aim to mask the ringing sounds with other natural sounds through sound therapy or behavioral therapy. Hearing aids may also help by making external sounds clearer and more noticeable than the tinnitus noises.