<Tr> <Th> Frequency </Th> <Td> Rare (US) </Td> </Tr> <Tr> <Td_colspan="2"> (edit on Wikidata) </Td> </Tr> <P> Thiamine deficiency, also known as beriberi, is a condition that occurs due to not enough thiamine (vitamin B1). There are two main types: wet beriberi, and dry beriberi . Wet beriberi results in a fast heart rate, shortness of breath, and leg swelling . Dry beriberi results in numbness of the hands and feet, confusion, trouble moving the legs, and pain . A form with loss of appetite and constipation may also occur . </P> <P> Risk factors include a diet of mostly white rice, alcoholism, dialysis, chronic diarrhea, and taking high doses of diuretics . Rarely it may be due to a genetic condition which results in difficulties absorbing thiamine found in food . Wernicke encephalopathy and Korsakoff syndrome are forms of dry beriberi . Diagnosis is based on symptoms, low levels of thiamine in the urine, high blood lactate, and improvement with treatment . </P>

A deficiency of thiamin causes a disorder called