Weak or Brittle Nails: What They May Mean
Weak, splitting, or brittle nails are common and usually aren’t a sign of a serious disease. They can sometimes provide clues about your health, but nail appearance alone can’t diagnose a deficiency or illness.
Possible causes include:
Frequent water exposure — repeated wetting and drying can weaken nails.
Cleaning chemicals or nail products — detergents, acetone, and frequent manicures can contribute.
Iron deficiency — can sometimes cause brittle or spoon-shaped nails.
Thyroid problems — particularly hypothyroidism, may affect nail growth and texture.
Fungal nail infections — often cause thickening, discoloration, or crumbling.
Nutritional deficiencies — severe deficiencies of certain nutrients can affect nails, although supplements aren’t automatically helpful if you’re otherwise well nourished.
Normal aging — nails often become thinner and drier with age.
What you can do
Keep nails reasonably short, wear gloves when working with water or cleaning products, moisturize your hands and nails regularly, and avoid excessive use of acetone or aggressive nail treatments.
If brittle nails are new, severe, persistent, or accompanied by fatigue, hair loss, unexplained weight changes, skin changes, or other symptoms, speak with a healthcare professional. They can determine whether blood tests—such as an iron or thyroid evaluation—are appropriate.
Don’t automatically start iron or other supplements just because your nails are brittle. Too much of some nutrients can be harmful.
