What are the classic symptoms of pellagra caused by vitamin B3 deficiency?

Pellagra is specifically associated with a deficiency of niacin, also known as vitamin B3. The classic triad of symptoms that define this condition consists of dermatitis, dementia, and diarrhea. Dermatitis typically manifests as a photosensitive rash, especially in areas of the skin that are exposed to sunlight. Dementia can present with various neurological symptoms, including cognitive decline and mood changes, while diarrhea may vary in severity and is often characterized by watery stools.

The combination of these three symptoms is what distinctly identifies pellagra, making the answer particularly relevant and accurate in the context of the question regarding the symptoms of vitamin B3 deficiency. Understanding these classic symptoms is crucial for a correct diagnosis and appropriate management of the condition.