Bell's Palsy (from our understanding) if it is true Bell's Palsy does not have any chance of having mortality or killing anybody. There are situations where we believe Bell's Palsy is what's going on and in fact, it's not Bell's Palsy. There are other situations where it's a more severe virus - it is a stroke or it could be an infection at the skull base, especially in diabetes (called Otitis Externa) which can actually spread to the brain and brainstem. Bell's Palsy in itself should not be fatal, should not have any long-term problems other than potential weakness in the face. However, you have to make sure that these other things aren't going on. That's why it's not something to diagnose or treat yourself - you always go to a doctor to have them evaluate it properly.