The aberrant innervation leading to this phenomenon may be seen for example as a hereditary trait in some patients with Branchio-oto-renal (BOR) syndrome in which case it may occur unilateral or bilateral, but it may also result from a secondary aberrant reinnervation following a peripheral facial palsy, in which case it is associated with uncontrollable ipsilateral tearing. In the past gustatory lacrimation was considered to be a very rare non-hereditary type of anomalous, cranial nerve-end organ innervation but rare occurences in patients with Branchio-oto-renal (BOR) syndrome have shown, that this feature may also appear as a hereditary condition.