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@hippy
Post-traumatic conductive hearing loss (CHL) may be due to ossicular chain disruption. Should hearing loss occur after a trauma, symptom chronology must be assessed and audiometric information obtained. In the first few days following injury, hearing may be difficult to evaluate, especially in the event of hemotympanum, which may lead to a transient CHL. Nevertheless, temporal bone trauma is frequently associated with brain and cervical spine injuries [1] that sometimes require surgical management. Six months after a temporal bone trauma, persistent CHL occurs in 50 % of patients [2].
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4877355/
There can be damage either to the ear itself or to the central auditory pathways that process the information conveyed by the ears. People who sustain head injury are susceptible to hearing loss or tinnitus, either temporary or permanent. Contact sports like football (U.S. NFL), hockey and cricket have a notable incidence of head injuries (concussions). In one survey of retired NFL players, all of whom reported one or more concussions during their playing careers, 25% had hearing loss and 50% had tinnitus.
https://en.wikipedia.org/wiki/Sensorineural_hearing_loss#Head_trauma