Hi.. Reduced hearing can occur due to multiple reasons.. It can occur due to infection and inflammatory changes in the ear.. An ENt evaluation with BERA and other audiometry studies will help in clinching the diagnosis...
A Bone Anchored Hearing Aid (BAHA) or a Vibrant Sound Bridge (VSB) on your left side will help overcome your problem, if your audiogram shows a sensorineural hearing loss in your left ear.