Like the skin, the fingernails are a reflection of a person's state of health. Low levels of zinc and iron as well as thyroid problems can cause brittle nails. However, brittle nails are often a normal result of aging.
Review Date: 3/30/2007
Reviewed By: A.D.A.M. Medical Illustration Team
Reviewed By: A.D.A.M. Medical Illustration Team
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