Health condition
Nail changes to check
Nails are a window on health: most changes are benign, but a new dark streak, a nail that lifts or crumbles, or clubbing of the fingertips deserve medical review.
Key points
What matters most, at a glance.
The essentials in plain English - symptoms, when to seek help, who to see and what treatment looks like.
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A new brown or black streak in a single nail should be checked to exclude nail melanoma
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Clubbing (bulbous fingertips with curved nails) can signal lung or heart disease
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Pitting and lifting can indicate psoriasis; spoon-shaped nails suggest iron deficiency
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Specialist: a consultant dermatologist for undiagnosed or progressive nail changes
Understanding it
About Nail changes to check, and what to do next.
Because nails grow slowly, they record what has happened to the body over months: horizontal grooves after illness, small white marks after minor trauma, brittleness with age and detergents. The changes that genuinely matter include a new pigmented streak in one nail (especially with pigment spreading onto the surrounding skin), painless lifting or destruction of a single nail, fingertip clubbing, and marked colour change of most nails.
Single-nail changes usually need dermatology assessment, sometimes with a biopsy of the nail matrix, while changes across all nails more often reflect internal health and prompt blood tests. Photographing the nail monthly helps track whether anything is evolving. Most people start with their GP, who can refer to a consultant dermatologist. In many parts of the UK, routine NHS referrals for this kind of problem currently take 20-45+ weeks depending on where you live, whereas an initial appointment with a private consultant is typically available within around two weeks.
A quiet reminder
This guide is for information, not medical advice.
Your GP knows your history and can tell you which parts apply to you. If in doubt, see them.
Frequently asked
Common questions about Nail changes to check.
Quick, plain-English answers to what people ask us most.
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What nail changes should I check for?
Watch for changes in nail colour, thickness, shape, or texture, including new dark streaks, pitting, separation from the nail bed, clubbing, or persistent ridging, as these can sometimes reflect an underlying skin, systemic or, rarely, cancer-related condition.
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What causes concerning nail changes?
Causes range from common and benign, such as fungal infection, minor trauma or psoriasis, to less common but more serious causes including nutritional deficiencies, lung or heart disease, and rarely, melanoma.
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Are most nail changes serious?
No, most nail changes reflect benign, common causes like fungal infection or minor injury, but certain patterns, such as a new dark streak, especially with irregular borders, warrant prompt specialist assessment to exclude something more serious.
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How can I tell if a nail change needs urgent assessment?
Seek prompt assessment for a new or changing dark streak in a nail, especially if irregular or affecting the skin around the nail, sudden nail clubbing, or nail changes accompanied by other systemic symptoms.
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How are nail changes investigated?
Investigation typically starts with a clinical examination, sometimes with dermoscopy for pigmented changes, and depending on suspected cause, may include fungal sampling, blood tests, or biopsy for concerning pigmented lesions.
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How are nail changes treated?
Treatment depends entirely on the underlying cause, ranging from antifungal treatment for infection, to management of an underlying skin or systemic condition, or specialist referral and biopsy for any concerning pigmented change.
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When should I see a dermatologist about nail changes, and how quickly can I be seen privately?
See a dermatologist promptly for any new dark nail streak or rapidly changing nail appearance. A private dermatologist can typically arrange assessment within about one to two weeks.