Pellagra

Pellagra is a disease is caused when a person lacks sufficient amount of niacin (vitamin B3) or tryptophan in their diet. Very small amount of niacin or tryptophan in a person’s diet may lead to pellagra. Pellagra may also occur if the body is unable to absorb these nutrients. Thus, it may lead to the development of the disease after gastrointestinal disease or influence of alcohol.
Pellagra is usually found in those areas of the world where people consume a lot of corn in their diet. The most commonly observed symptoms caused as a result of pellagra are
Diarrhea
Scaly skin sores
Inflamed mucus membranes
Delusions
Mental confusion