Question

what meaning of pellagra and it causes

Answer 1

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Pellagra is a disease caused by low levels of niacin, also known as vitamin B-3. ....

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Answer 2

Pellagra is defined by the systemic disease resulting from niacin deficiency, and it is characterized by diarrhea, dermatitis, dementia, and death, which usually appear in this order. GI tract symptoms always precede dermatitis, or, according to Rille, "Pellagrabegins in the stomach"
Pellagra is a disease caused by low levels of niacin, also known as vitamin B-3. It's marked by dementia, diarrhea, and dermatitis, also known as “the three Ds”. If left untreated, pellagra can be fatal.