Hearing loss

What are the different types of hearing loss?

Hearing loss can be categorized by many different types. Two types of hearing loss are sensorineural and conductive. Both types of hearing loss can be congenital (present at birth) or acquired.

  • Sensorineural - a loss of function within the inner ear or with the connection to the brain. Causes of this type of hearing loss include:
    • Congenital factors - Conditions present at birth, such as:
      • Genetic factors and syndromes the child has at birth.
      • Infection by the mother with toxoplasmosis, rubella, cytomegalovirus, herpes or syphilis.
      • Low birthweight.
      • Hereditary - in the family.
    • Acquired
      • Loud noise exposure.
      • Trauma.
      • Infections.
      • Damage from certain medications that can be harmful to the ears.
  • Conductive hearing loss - a problem in the outer or middle ear where sound waves are not sent to the inner ear correctly. Conductive hearing loss is the most common type of hearing loss in children and is usually acquired. Factors that may cause this type of hearing loss are:
    • Congenital factors - Conditions present at birth, such as:
      • Anomalies of the pinna (the outside of the ear).
      • Anomalies of the tympanic membrane (eardrum).
      • Anomalies of the external ear canal.
      • Anomalies of the ossicles (the three tiny bones that deliver the sound waves to the middle ear).
    • Acquired
      • Ear infections such as otitis media.
      • Excessive wax.
      • Foreign bodies in the ear canal, such as beads or popcorn kernels.
      • Tumors of the middle ear.
      • Problems with the eustachian tube.
      • Chronic ear infections with fluid in the middle.
      • Perforation of the eardrum.