There are generally five different types of hearing loss, and those are: Sensorineural Hearing Loss, Conductive Hearing Loss, Mixed Hearing Loss, Central Hearing Loss, and Functional Hearing Loss.
Check out the link below to learn more.
An Overview of the Different Types of Hearing Loss
When do people suffer from hearing loss?
Link: http://www.hivehealthmedia.com/an-overview-of-the-different-types-of-hearing-loss/