disorders of nutrition
Niacin Deficiency
Symptoms of Niacin Deficiency
Later, fatigue, insomnia, and apathy develop. Malfunction of the brain (encephalopathy) usually follows. It is characterized by confusion, disorientation, hallucinations, and memory loss. People may be overexcited, depressed, extremely elated (manic), delirious, or paranoid (thinking that people intend to harm them).