Malformation of outer ear, ear canal or middle ear structures. Problems associated with middle ear pathology such as fluid in the middle ear from colds and allergies Poor Eustachian tube function Ear infection, perforated eardrum and benign tumors. Impacted earwax Foreign body in the ear

1. CAUSES OF
HEARING LOSS
Causes of conductive hearing loss

2. Causes of conductive hearing loss
Malformation of outer ear, ear canal or middle ear structures.
Problems associated with middle ear pathology such as fluid in the
middle ear from colds and allergies
Poor Eustachian tube function
Ear infection, perforated eardrum and benign tumors.
Impacted earwax
Foreign body in the ear
Otosclerosis which is abnormal growth of bone of the middle ear

4. Causes of sensorineural hearing loss
There are two types of causes
Prenatal or Perinatal causes
Postnatal causes

5. PRENATAL OR PERINATAL CAUSES
Infections such as rubella, herpes, toxoplasmosis, syphilis and
cytomegalovirus.
Hearing loss that runs in family.
Asphyxia or lack of oxygen at birth.
Birth weight of less than 1500 grams.
Defects of head and neck.

7. POSTNATAL CAUSES
Exposure to loud noise.
Bacterial Meningitis
Ototoxicity caused by exposure to drugs
Physical damage to head or ear
Hearing loss due to aging which is called as presbycusis

8. POSTNATAL CAUSES

9. Other descriptors associated with hearing
loss
Bilateral
Hearing loss in both ears.
Unilateral
Hearing loss in one ear and normal in other ear.
Symmetrical

10. Other descriptors associated with hearing
loss
In symmetrical hearing loss the degree and configuration are similar
in both ears.
Asymmetrical
In asymmetrical hearing loss the degree and configuration are
different in both ears.

11. Other descriptors associated with hearing
loss
Progressive versus sudden
In progressive hearing loss the loss becomes worse over time where
as in sudden the loss happens quickly.
Fluctuating versus stable
Fluctuating hearing loss changes over time, sometimes getting
better sometimes getting worse. Stable hearing loss does not change
over time and remains the same.

12. References
https://www.hearingsol.com/help/hearing-loss/causes/
https://www.hearingsol.com/