1. Abnormal development of the outer ear, including malformation of the ear canal, ear drum, or middle ear bones.
2. Infections of the ear, such as otitis media, which can cause inflammation and scarring of the ear canal.
3. Exposure to loud noises, which can damage the delicate structures of the ear.
4. Blockage of the ear canal due to wax buildup, foreign objects, or fluid.
5. Certain medications, such as certain antibiotics, that can cause hearing loss.
6. Genetic factors, such as a family history of hearing loss.
7. Diseases such as meningitis, measles, mumps, or rubella, which can cause hearing loss.
8. Head trauma or injury, which can damage the delicate structures of the ear.