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What are some of the causes of bent fingernails?

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Quick Answer

Koilonychia and clubbing are two nail abnormalities that cause bent fingernails, and they are symptoms of underlying medical conditions, explains Healthline. Koilonychia may be a sign of heart disease, iron deficiency, lupus, hemochromatosis or Raynaud's disease. Clubbing may develop due to inflammatory bowel disease, cardiovascular disease, liver disease or AIDS.

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Full Answer

Koilonychia causes the nails to bend outward, creating a spoon-like appearance. With this condition, the nails are so curved that they can hold a drop of liquid, explains Healthline. Clubbing causes the nails to bend downward and curve around the fingertips. Clubbing slowly develops over the course of many years, according to Mayo Clinic.

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