In tinnitus, the sounds a person hears are actually perceptions. Since there's no actual source, they are often referred to as "phantom noises". I read that about 8% of all people in the US suffer from tinnitus so you are not the only one who hears these strange noises.
Tinnitus is actually not a disease. It is actually a symptom of a problem that is rooted deep, somewhere within your body. The problem could be a simple one like an infection in the ear, or even simpler, such as ear wax. Just clear the wax and get the infection treated, and the noises could go away. In some people, it could even be the result of a side-effect of a drug they took. Or it could be more complicated.
If you want to know more about this condition and wnat to learn how to solve naturally your problems with these annoying noises you should read this ebook: http://tinnitus.toptips.org
It helped me a lot.