Bilateral Hearing Loss refers to a hearing loss that occurs in both ears.
Unilateral Hearing Loss refers to a hearing loss that presents in only one ear. In some cases unilateral hearing loss may be referred to as single-sided deafness.
Symmetrical Hearing Loss refers to a loss that is at the same level in both ears.
Asymmetrical Hearing Loss refers to a loss that presents at different levels in each ear.
Progressive Hearing Loss means that hearing loss becomes worse over time. An individual with progressive hearing loss may begin with a mild loss that progresses to moderate, severe or even profound over time.
Sudden Hearing Loss (also referred to as rapid onset or acute hearing loss) occurs without warning. Such a hearing loss requires immediate medical attention to determine its cause and treatment. In many cases, this type of hearing loss can be treated or even reversed.
Fluctuating Hearing Loss refers to a hearing loss that may fluctuate over time. Individuals with conductive hearing loss often experience fluctuations in their hearing due to middle ear fluid or ear infections.