The exact pathophysiology of<unk> '<unk>  is not known.<unk> 's<unk>  occurs due to failure to function in a normal manner of the facial nerve (VII cranial nerve). The malfunction of the facial nerve caused involuntary spasm in the facial muscles which called facial<unk> .<unk> 's<unk>  causes the lower motor neuron type paralysis. Although the exact etiology of<unk> 's<unk>  is unknown, there is some evidences that implies there may be some relation between vasospasm, from any cause, along any facial nerve branch, with<unk> 's<unk> . There is no established association between genetic factors and<unk> 's<unk> . Hereditary components may play a role in familial recurrent<unk> 's<unk> . On microscopic histopathological analysis, thickened perineurium, infiltrates of inflammatory cells between nerve bundles and around blood vessels are characteristic findings of<unk> ’s<unk> . It appears that the histology of the facial nerve in<unk> 's<unk>  is similar to Herpes Zoster infection, suggestive of an infectious cause.
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