Occlusion

Your hearing instrument is a physical object that occupies space in your ear canal. The sensation of having something in your ear which blocks the sound is referred to as the 'occlusion effect'. Many hearing aids and moulds have a built in vent or small groove that allows air to pass in and out of the ear. This generally combats occlusion, but again if this is still a distraction after several weeks then an adjustment to the aid may be needed. However, it is important to remember that you will never hear normally or totally naturally as the ear is not designed to have a foreign object sitting in it.