Weak or Brittle Nails: What Your Body May Be Telling You
Brittle, splitting, or peeling nails are common and often caused by everyday factors, such as repeated exposure to water, detergents, nail polish/remover, or physical trauma. They don’t automatically mean you’re deficient in a particular vitamin.
Possible causes
Iron deficiency: Can sometimes cause brittle or spoon-shaped nails, particularly when accompanied by fatigue or pale skin.
Thyroid disorders: Both underactive and overactive thyroid conditions can affect nails.
Nail fungus: More likely when a nail becomes thick, discolored, crumbly, or separated from the nail bed.
Psoriasis or eczema: Can produce pits, ridges, discoloration, or changes in nail texture.
Nutritional deficiencies: Severe deficiencies of nutrients such as iron, zinc, or certain B vitamins can affect nail growth, but supplementation isn’t automatically helpful if you’re not deficient.
Normal aging: Nails often become thinner and more brittle with age.
Repeated wetting and drying: Frequent handwashing, cleaning, or prolonged water exposure can make nails split and peel.
What you can do
Keep nails reasonably short, wear gloves when using cleaning products, moisturize your hands and nails regularly, and avoid aggressively scraping or buffing the nail surface.
Don’t automatically start high-dose biotin or iron supplements. If brittleness is persistent, widespread, or accompanied by other symptoms, a healthcare professional can determine whether testing is appropriate.
And if one nail suddenly changes color, develops a dark streak, becomes painful, or changes dramatically without an obvious cause, have it examined rather than assuming it’s a nutritional problem.
