12 Surprising Causes of Spoon-Shaped Nails (Koilonychia)

12. Hemochromatosis

Hemochromatosis, a genetic disorder that causes excessive iron accumulation in the body, can also result in koilonychia. While iron deficiency is a more common cause, the excess iron in hemochromatosis damages tissues and organs, including those responsible for nail health. The condition often leads to brittle, deformed nails due to systemic disruptions in iron metabolism. Other symptoms of hemochromatosis include joint pain, fatigue, and skin pigmentation changes. Managing iron levels through regular blood removal (therapeutic phlebotomy) or medications can help alleviate associated symptoms, including koilonychia.