Weak or brittle nails: what your body may be telling you
Weak, splitting, peeling, or brittle nails are common and usually aren’t a sign of a serious illness. Often, the cause is much simpler: aging, repeated exposure to water, soaps, detergents, nail polish remover, or minor nail trauma.
Possible causes
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Frequent water exposure: Repeated wetting and drying can make nails split and peel.
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Iron deficiency: May cause brittle or spoon-shaped nails, particularly when accompanied by fatigue or pale skin.
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Thyroid problems: Both underactive and overactive thyroid disorders can affect nail growth and texture.
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Nutritional deficiencies: Inadequate protein or certain nutrient deficiencies can contribute.
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Fungal infection: More likely when a nail becomes thick, crumbly, yellowish, or separates from the nail bed.
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Psoriasis or eczema: These can cause pits, ridges, discoloration, or other nail changes.
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Aging: Nails naturally become thinner and more fragile with age.
What you can do
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Keep nails short and file them gently.
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Wear gloves when doing dishes or using cleaning products.
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Moisturize your hands, nails, and cuticles regularly.
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Reduce prolonged soaking and frequent acetone use.
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Eat a varied diet containing adequate protein, iron, and other nutrients.
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Don’t automatically take high-dose biotin or iron supplements unless a deficiency has been identified or a clinician recommends them.
When to see a doctor
Have persistent or worsening nail changes evaluated, particularly if several nails are affected or you also have fatigue, unexplained weight changes, hair loss, skin changes, or other symptoms.
A new dark streak under a nail, especially one that becomes wider or extends onto the surrounding skin, should be assessed promptly.
If you describe what you’re seeing—splitting, ridges, grooves, white spots, yellowing, thickening, or spoon-shaped nails—I can explain the more likely causes.
