Hello doctor, When we are in silence, we always hear some sound. I know we are not in a vacuum, so some external sound will always be audible house noises, etc.? Hope this is not tinnitus. Even sensory deprivation of ear causes body noises and hallucinations, read in places that are created as 0 dB anechoic chamber.
Hello. This is not tinnitus. Tinnitus would be heard easily, trouble you, and you would not have to search for it specifically. Tinnitus would be heard even in an environment with some sound not sufficient to mask tinnitus. It may interfere with your daily activities. And yes, in an external 0 dB environment, one may normally hear sounds of his body like of blood flow, heartbeats, respiratory sounds, etc. So, this is quite normal. Hallucinations are different thing. It hears sounds, seeing objects and human which are not there and real, usually to trouble you, harm you. I hope this helps you and get back if you have any doubts.