Hearing loss is when your ears don't work as well as they should, so you can't hear as clearly as other people. It can be caused by lots of different things, like loud noises, medicine, and viruses. When you have hearing loss, it can be hard to follow conversations and make out sounds like music or people's voices. You can sometimes help hearing loss by using hearing aids (small devices you wear in your ear) or cochlear implants (devices thatcan be surgically placed in your ear).