When you can hear sounds inside your head that are created by your hearing system, not your environment, the condition is known as tinnitus. It could be ringing, humming, pulsing or hissing. It is more prominent in quiet areas or at night. It usually has no particular cause, but can still be treated.
This is a companion discussion topic for the original article at https://patient.info/ears-nose-throat-mouth/tinnitus-leaflet