Body · Pattern guide
Thick or discoloured nail
A nail that becomes thicker, brittle, crumbly or discoloured needs a careful check before treatment. Guidance, not a diagnosis.
Browse concerns Story cardWhat it looks like
Signs
a toenail or fingernail becoming thickerwhite, yellow, brown or other new colour changea brittle, split or crumbly nailnail lifting or buildup beneath the nail
What may help
Options
keep feet clean and drydo not share nail toolspharmacist or clinician confirmation
When to get help
Pause here
Ask a pharmacist or clinician to check a new or persistent nail change before choosing treatment. Pain, swelling around the nail, spread to several nails, diabetes, weakened immunity, pregnancy, breastfeeding or age under 18 needs clinician review. A new or changing dark band, darker skin around a nail, a nail that splits down the middle or a new bump beneath a nail needs a prompt in-person skin examination.
Sources
Checked links.
Reviewed July 2026
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