That's when a white noise machine can help— by reducing the contrast between the tinnitus sound and the background noise around you. Many audiologists suggest masking the ringing sound by playing a sound at a constant low level to make tinnitus less noticeable. A constant ‘shushing’ sound at a comfortable level can be quite soothing and distracting. Your brain then can focus on another, comforting sound rather than the tinnitus.
Certain environmental factors can exacerbate tinnitus such as stress, anxiety, depression, and even some medications. As tinnitus itself can lead to anxiety, stress and sleep deprivation, this can create the feeling of being trapped in a vicious cycle. A white noise machine that constantly plays soothing sounds aids in relaxation, so a sufferer is less likely to be upset for long periods of time if they use a controlled sound environment to help them unwind and deal with stresses of the day.
Just as white light is made up of all of the colors of the rainbow, white noise is a mix of a range of different sounds mixed together from low frequency to high frequencies. Since it incorporates such a range of sounds, it can be helpful to people with tinnitus no matter what type of tinnitus noise they hear— low pitched, mid pitched or high pitched can benefit from white noise. It's not a cure but can definitely help.
Use this helpful White Noise Machine Guide to help find the best unit for your situation and environment.