Hoarseness in pellagra.

A 67-year-old woman with chronic alcoholism was referred to our hospital with a 3-month history of progressive weakness in all four extremities and a 5-day history of hoarseness. On admission, she presented with glossitis and laryngitis. Neurological examination revealed weakness in all extremities and nerve conduction studies showed polyneuropathy. She was diagnosed with thiamine deficiency and administered intravenous multivitamins, including thiamine, pyridoxine and mecobalamin. Although the weakness in her extremities was ameliorated after treatment, her glossitis and laryngitis did not improve and psychosis subsequently occurred. After administration of nicotinamide, her psychosis and laryngitis dramatically improved. She was diagnosed with pellagra after detection of decreased serum levels of niacin and thiamine. Weakness may have been due to thiamine-deficient neuropathy or multiple vitamin deficiencies, as it improved with thiamine, pyridoxine and mecobalamin therapy. Because of lack of response to thiamine therapy, we concluded that the psychosis and laryngitis were caused by pellagra. Although stomatitis and glossitis in pellagra has been well documented, laryngitis and hoarseness appear to be very uncommon conditions. Differences in the turnover rates or energy requirements between the gastrointestinal tract and larynges may be a reason for the rarity of laryngeal involvement in pellagra. We should be vigilant to hoarseness, caused by laryngitis, which can be the predominant symptom in pellagra.