DO_rare_slim has symptom disease has feature dementia nutritional deficiency disease pellagra ICD9CM:265.2 MESH:D010383 DOID:8457 UMLS_CUI:C0030783 GARD:10014 disease_ontology A nutritional deficiency disease that is characterized by deficiency of niacin (vitamin B3), has_symptom gastrointestinal disturbance, anorexia, diarrhea, dementia, hallucinations, depression, psychosis, and/or non-specific skin changes, and has_material_basis_in deficiency of niacin, often from inadequate diet, malabsorption, or medication side effects. Niacin deficiency Niacin-tryptophan deficiency SNOMEDCT_US_2025_09_01:267491008 depression anorexia diarrhea hallucination