Weak or Brittle Nails: What Could Your Body Be Telling You?
Brittle nails are very common and don’t automatically mean you have a vitamin deficiency or serious illness. Frequent handwashing, water exposure, nail polish/gel manicures, and simply getting older can all make nails dry and prone to splitting.
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However, persistent or newly worsening nail changes can sometimes provide clues about your health.
Iron deficiency: Thin, fragile nails—especially nails that become concave or “spoon-shaped”—can occur with iron-deficiency anemia.
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Thyroid problems: Hypothyroidism and other thyroid disorders can cause dry, brittle, ridged or easily broken nails, usually along with other symptoms.
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American Academy of Dermatology
Fungal infection: Nails that become thick, yellow, crumbly or cracked may have a fungal infection.
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Skin conditions: Psoriasis and eczema can affect the nail’s texture and growth.
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Nutritional problems: Inadequate protein or deficiencies involving nutrients such as iron, zinc or certain B vitamins can contribute to fragile nails.
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Normal aging: Vertical ridges and increased brittleness become more common as we get older and aren’t necessarily a sign of disease.
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What you can do
Keep nails relatively short, moisturize your hands and cuticles regularly, wear gloves when your hands are repeatedly exposed to water or cleaning products, and limit aggressive manicures and frequent gel-polish removal.
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Don’t automatically start iron, zinc, biotin or other supplements. If a deficiency is suspected, it’s better to identify it first rather than taking high-dose supplements unnecessarily.
When to get your nails checked
See a doctor or dermatologist if the change is new, persistent, affects several nails, causes pain or swelling, or is accompanied by other symptoms. A new or changing dark streak under a nail deserves particular attention because, although uncommon, it can be melanoma.
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American Academy of Dermatology
Bottom line: Brittle nails are often caused by dryness, repeated water/chemical exposure, cosmetics, or aging—but persistent changes can occasionally signal an underlying problem worth checking.
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