Health condition
Beau's lines
Beau's lines are horizontal grooves across the nails marking a temporary halt in nail growth, most often caused by significant illness, fever or chemotherapy.
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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Transverse grooves across one or more nails, growing out towards the tip over months
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Grooves across most nails at the same level suggest a whole-body cause a few weeks earlier
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A groove in a single nail usually reflects local injury to that nail root
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Specialist: a consultant dermatologist if grooves are recurrent and no cause is apparent
Understanding it
About Beau's lines, and what to do next.
The nail matrix pauses production when the body is under serious strain, and that pause is recorded as a groove that then travels outward as the nail grows. Because fingernails grow around 3 mm a month, the distance from the cuticle dates the insult: severe infections (including COVID-19), high fevers, major surgery, heart attacks, chemotherapy and severe zinc deficiency are classic causes, while a single-nail groove usually follows local trauma or overzealous manicuring.
Beau's lines need no treatment themselves; they grow out completely within about six months on fingernails and up to eighteen on toenails. Their value is as a clue, and recurrent unexplained lines justify a general health review. 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 Beau's lines.
Quick, plain-English answers to what people ask us most.
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What is beau?
Beau is a recognised medical condition that can affect people in different ways, ranging from mild and easily managed to more significant, depending on the underlying cause, how early it is picked up, and how it is treated. Getting a clear diagnosis is usually the first step towards the right management plan.
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What causes beau?
Beau can arise from a combination of factors, which may include genetics, lifestyle, environmental exposures, other underlying health conditions, or simply the normal effects of ageing on the body. In many cases no single cause is found, and several factors act together. A clinician can help identify which factors are most relevant in an individual case.
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What are the symptoms of beau?
Symptoms of beau vary from person to person and depend on how severe the condition is and which structures are affected. Some people notice symptoms gradually over weeks or months, while others experience a more sudden onset. Because symptoms can overlap with other conditions, a proper assessment is important to reach an accurate diagnosis rather than relying on symptoms alone.
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Is beau serious or dangerous?
Most cases of beau are manageable, especially when identified and treated early, but severity varies from mild and self-limiting to more significant, depending on individual circumstances. Left unassessed, some cases can lead to complications or a longer-term impact on daily life. If you are worried about your symptoms, it is always worth getting them checked rather than waiting.
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Is beau hereditary or genetic?
Some cases of beau have a genetic component and can run in families, while others occur without any family history at all. Having a relative with the condition may modestly increase your own risk, but it does not mean you will definitely develop it yourself. If you are concerned about a family history, mention this to your doctor, as it may occasionally influence screening or monitoring.
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Can beau be cured, reversed or prevented?
Outlook varies with beau: some cases resolve completely with treatment, others improve significantly but need ongoing management, and a smaller number become a long-term condition to be controlled rather than cured. Prevention strategies, such as addressing modifiable risk factors, can reduce your chances of developing it or of it recurring, but cannot guarantee against it in every case.
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How is beau treated?
Treatment for beau is tailored to the individual and depends on severity, underlying cause and personal circumstances. Options can range from simple lifestyle measures, monitoring and conservative treatment through to medication, specialist procedures or surgery in more significant cases. A specialist assessment helps identify which combination of treatments is most appropriate for you.
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How long does beau last?
The duration of beau varies considerably: some people recover within days or weeks, while others live with a more persistent or recurring condition that needs ongoing management. Response to treatment, how early it is started, and individual factors all influence the timescale. Your clinician can give you a more personalised estimate once your specific circumstances are known.
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When is surgery needed for beau?
Surgery is not usually the first option for beau and is generally reserved for cases where conservative treatment has not worked, symptoms are severe, or there is a significant structural problem that needs to be corrected directly. The decision depends on your specific findings, symptoms and how they are affecting your life. A specialist consultation is the best way to establish whether surgery is being considered too early, or should be considered sooner rather than later.
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When should I see a doctor about beau, and how quickly can I be seen privately?
It is worth seeing a doctor about beau if symptoms are persistent, getting worse, or affecting your daily life, rather than waiting to see if they settle on their own. NHS routine referrals to a specialist can currently take anywhere from around 20 to 45 weeks or more depending on your area, whereas a private consultant can typically see you within about 2 weeks. Getting an earlier assessment can help clarify the diagnosis and start the right treatment sooner.