Due to facial nerve irritation, which manifests as asymmetry in the grin or frown, facial droop, alterations in tear production, and inability to completely close the afflicted eye.
Bell's palsy is a condition that causes the muscles on one side of the face to suddenly deteriorate. Most often, the weakness is momentary and becomes much better over a few weeks. The weakening seems to make the lower half of the face droop. It's challenging for the affected eye to close during one-sided smiles.
Although the exact cause of Bell's palsy is uncertain, it is believed that immune system dysfunction brought on by inflammation is to blame. Other diseases like diabetes are connected to it.
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