Types and Causes

Types and Causes

There are three main types of hearing loss: conductive, sensorineural and mixed

Conductive Hearing Loss

This occurs when there is a problem with the outer or middle ear.

Causes
  • Malformation of outer and middle ear structures
  • Could be hereditary or can occur during an accident
  • Accumulation of fluid in the ear canal
  • Ear infections like otitis media
  • Perforated eardrum(s)
  • Allergies
  • Benign tumors
  • Impacted earwax obstructing passage of sound
  • Infection of the ear canal
  • Presence of foreign bodies

Sensorineural Hearing Loss

Sensorineural hearing loss can occur due to damage to the nerves in the inner ear or due to damage to the cochlea. It cannot be reversed or treated.Noise induced hearing loss is caused due to exposure to high intensity noise which causes permanent nerve damage.

CAUSES
  • Before or during birth
  • Lack of oxygen at the time of birth
  • Heredity
  • Infections such as rubella, herpes, toxoplasmosis, syphilis, cytomegalovirus (CMV)
  • Later onset
  • Bacterial meningitis
  • Drug-induced ototoxicity
  • Intense noise
  • Physical damage to the head or ear
MIXED

This could occur because of problems associated with both the inner and outer or middle ear.