Types of hearing loss
Conductive Hearing Loss
This type of hearing loss occurs when the external and middle ear can no longer conduct sound into the inner ear. One of the most common causes of conductive hearing loss is blockage in the external ear canal, typically caused by earwax build up or infection which this stops sound entering the middle ear. Most cases are temporary and can be corrected with proper treatment.
Causes of conductive hearing loss are typically obstructions such as:
• Infections of the ear canal or middle ear resulting in fluid or pus build up
• Perforation or scarring of the eardrum
• Wax build up
• Dislocation of the middle ear bones (ossicles)
• Foreign objects in the ear canal
• Otosclerosis (an abnormal bone growth in the middle ear)
• Abnormal growths or tumours
Mixed Hearing Loss
This type of hearing loss is a combination of sensorineural and conductive hearing loss. This type of loss may be successfully treated with a combination of medical assistance and use of a hearing aids.
Sensorineural Hearing Loss
Sensorineural is the most common type of hearing loss and generally can be easily aided .It is caused by withering of the hair cells in the inner ear generally due to age, noise damage or medications. Without these hair cells the ear cannot detect sounds properly. Sensorineural hearing loss can often be successfully treated with hearing aids. This type of hearing loss may result from.
Causes of sensorineural hearing loss:
• Head or ear injuries
• Excessive noise exposure
• Viral infections (such as measles or mumps)
• Ototoxic drugs (medications that damage hearing)
• High fever
• Ménière's disease (a disorder of the inner ear that can affect hearing and balance)
• Acoustic tumours