Symptoms
Brittle, crumbling nails: fungal or something else?
Nails that split, flake or crumble away at the tip are telling you the keratin structure has been weakened — by fungus, by chemistry, or by simple dehydration.
Summary
Onychomycosis destroys keratin from within, so the nail crumbles into powder rather than splitting into layers. Brittleness from detergents, acetone or frequent gel manicures tends to peel in flat sheets and affects several nails equally.
Distinguishing features
The texture of the debris is the clue.
- Fungal: dry, crumbly, yellow-white material packed under the nail
- Chemical or trauma: thin translucent flakes peeling from the surface
- Iron deficiency: spoon-shaped, soft nails across both hands
- Lichen planus: ridging with thinning and sometimes scarring
Treatment options
Where infection is responsible, removing the diseased nail is the fastest way to stop the crumbling advancing. Where the cause is external, gloves for wet work, a break from gel, and a urea-based nail cream restore condition over a few months.
When to seek medical advice
See a GP if nails become brittle suddenly across all fingers, if there is associated hair loss, or if you have symptoms of anaemia or thyroid disease.
Frequently asked questions
Do nail supplements help?
Biotin has modest evidence for brittle nails from non-infectious causes. It does nothing for an established fungal infection.
References
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Medical disclaimer. This article is general information written for a UK audience. It is not medical advice and does not replace assessment by a GP, pharmacist or podiatrist. Always read the patient information leaflet supplied with any product before use.