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Occasional patients with head/neck cancer undergo significant radiation to the region of the ear. It is generally thought that there are two phases of damage - -a short term damage from direct damage to tissue, and a long term damage due to radiation affecting the circulation. This may start at 2 years or more.
Sun et al (2016) reported on 38 patients who were radiated for nasopharyngeal carcinoma. At 3 months post radiation, there were only small reductions in the oVEMP and cVEMP.