The ear is the sensory organ most often injured when head trauma occurs. When trauma occurs there can be a disruption of the middle ear structures which ca produce a great or slight conductive hearing loss via torn eardrum, dislocation of the three-bone chain and/or an accumulation of blood in the middle ear cavity. These conditions can spontaneously improve.
Head trauma can also cause a disruption of the acoustic nerve. When concussion occurs bleeding has been demonstrated in the auditory and vestibular pathways, which can also account for the symptoms of hearing loss and dizziness.
When vestibular concussion occurs vertigo is the most common symptom and it may continue for months, appearing suddenly and briefly upon the assumption of a particular head position. Nausea and vomiting may accompany the vertigo.
You do not mention when you had the accident but it could take some tome for healing to take place. Consult your specialist again or go for a second opinion to make sure there is no medical problem with your ear after the accident.
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