secondary pellagra

sec·on·dar·y pel·lag·ra

pellagra resulting from any morbid condition that impairs nutrition by increasing the requirement or reducing the available supply of vitamins.
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Secondary pellagra occurs when there is enough niacin in the diet but something prevents its absorption and processing.
Despite sufficient dietary Niacin, Secondary Pellagra may be caused by a problem in Niacin absorption or metabolism.
Also, primary pellagra should be differentiated from secondary pellagra.