Q. Can thyroid problems cause nail problems?
Doctor Answer is medically reviewed by SecondMedic medical review team.
Yes, thyroid problems can cause nail problems. The most common nail changes associated with thyroid disease are splitting of the nails and spoon-shaped nails (koilonychia). Both of these changes are thought to be caused by a decrease in the quality of the nails' matrix, which is the layer of cells that produce keratin, a protein that forms the top part of the nail.
Other possible nail changes associated with thyroid disease include brittle nails and ridging of the nails. If you are experiencing any unexplained changes in your nails, it's important to see your doctor to have your thyroid levels checked.