If you hear a ringing in your occasionally, don't be too alarmed. If you hear it persistently for quite some time, I would be slightly worried and definitely more alarmed. This could mean that you eventually lose your hearing. Tinnitus is a common thing to experience and usually is nothing. But sometimes this can be an early sign that you could lose your hearing. I strongly encourage people to go and get this checked if they experience frequently and definitely educate yourself on it.