Iron-Deficiency Anemia and Its Association with Oral Burning Syndrome and Mucosal Pallor

Iron-deficiency anemia may present with oral burning, lingual atrophy, and mucosal pallor, although the clinical significance of these findings varies and none is independently diagnostic. Iron deficiency and anemia represent related but distinct conditions; depleted iron stores may occur without a reduction in hemoglobin, while anemia may arise from numerous causes unrelated to iron status. In patients with documented deficiency, oral burning should therefore be considered a possible secondary manifestation rather than assumed to represent primary burning mouth syndrome, which is diagnosed only after local and systemic causes have been excluded. Available observational studies have reported associations between abnormalities in iron status and oral burning, but heterogeneous definitions, selected patient populations, and limited methodological quality make causal interpretation difficult. Earlier histopathological studies suggest that iron deficiency may produce reversible epithelial changes, while small therapeutic studies indicate that oral discomfort can improve after iron replacement in some deficient individuals. These observations do not support routine iron therapy for idiopathic oral burning. Clinical findings such as mucosal pallor may raise suspicion but cannot reliably confirm anemia, identify its etiology, or exclude iron deficiency when absent. Evaluation should therefore combine history and oral examination with a complete blood count and appropriate measures of iron status, with ferritin interpreted in the context of inflammation. Management should focus on correcting confirmed deficiency and identifying the underlying cause, including occult blood loss, inadequate intake, or impaired absorption. Improvement should be assessed using both hematologic recovery and changes in oral symptoms. In the end, better-designed prospective studies are needed to clarify when iron deficiency contributes directly to oral symptoms and when it represents an incidental laboratory finding.