WARNING!
This is an older article that may not reflect Dr. Mercola’s current view on this topic. Use our search engine to find Dr. Mercola’s latest position on any health topic.
Vitamin B-12 deficiency is a known cause of central and peripheral nervous system damage. It has been implicated in sensory neuropathy and autonomic nervous system dysfunction -- which can in turn have a role in chronic, unexplained coughs.
A recent study showed that vitamin B-12 deficiency patients had a higher prevalence of laryngeal hyperresponsiveness. After being given B-12 supplements, their symptoms and laryngeal, bronchial, and cough thresholds significantly improved.