Which symptom is not associated with iron deficiency?

Corneal xerosis, which refers to dryness of the cornea, is not typically associated with iron deficiency anemia. Iron deficiency primarily affects hemoglobin production within red blood cells, leading to symptoms such as fatigue, pallor, and various other manifestations related to oxygen transport in the body. The other symptoms listed—pale conjunctiva, stomatitis, and spooning of the fingernails—are more directly linked to iron deficiency.

Pale conjunctiva is a result of reduced hemoglobin concentrations causing a paler appearance of the conjunctiva. Stomatitis, or inflammation of the mouth, may occur as the body struggles to maintain normal mucosal integrity when nutrients are lacking. Spoon-shaped fingernails are a classic sign of iron deficiency anemia, indicating changes in the structure of nails due to lack of hemoglobin.

In summary, while all the other options describe manifestations that may be seen in iron deficiency anemia, corneal xerosis is unrelated and does not fit into the expected symptomatology of this condition.