Physical

• dark skin patches
• dark knuckles
• dark eye area
• peeling skin
• redness
• scaly skin
• skin thickening
• mouth sores
• inflamed skin
• dementia
• diarrhea

Mental

• apathy
• dementia
• headaches
• depression
• low energy
• confusion
• irritability
• mood changes
• anxiety
• uneasy
• restless
• delusional
• disorientation

Other possible pellagra symptoms include:

• sores on the lips, tongue, or gums
• decreased appetite
• trouble eating and drinking
• nausea and vomiting