Hello. I am an Audiologist.
Tinnitus is the name for any sound we hear within our ears or head. Many people with varying levels of hearing sensitivity hear tinnitus. Spontaneous Otoacoustic Emissions are audible to other people, tinnitus is not. Evoked OAEs generally are not audible to the person being tested nor to others.
At this time, no one is sure what causes tinnitus. The mechanisms within the ear are too tiny to be studied with today’s imaging techniques. When a creature dies, the ear stops functioning, so there is little to be learned from dissecting the ears. A recent study found suggests that there may be a certain neurochemical that triggers tinnitus.
I have heard ringing in my ears my entire life, and I have normal hearing. Most people do not hear the ringing until they experience a mild to a moderately-severe degree of hearing loss. Typically, those with severe to profound levels of hearing loss do not hear tinnitus.
However, there are exceptions to every rule, and there appear to be different types of tinnitus that are associated with different ear pathologies. Without knowing more details about your specific case, I can only speculate… Feel free to reply here or contact me through my profile if you want to discuss it further.