Thick toenails: causes and treatment, and when to get help

In short

The NHS lists nails becoming thicker with age as a normal change, but fungal infection, injury, pressure from shoes and psoriasis can all thicken a toenail too.
About half of people with psoriasis have nail psoriasis, which can thicken and yellow the nails and look very like a fungal infection, so a thick nail is not always fungal.
A ram's horn nail (onychogryphosis) is a thick, curved overgrowth, usually of the big toenail, that a 2005 review links mainly to nails not being cut often enough.
In a 2018 review of 15 studies, older people with foot pain had about twice the odds of being fallers (odds ratio 1.95), so a painful thick nail is worth dealing with.
The Royal College of Podiatry says you can file the top of a thick nail to thin it; if nails are too tough to cut or you cannot reach them, the NHS suggests seeing a podiatrist.

The short answer

Most thick toenails come from one or more of five things: age, injury or pressure from shoes, a fungal infection, psoriasis, and poor circulation. The NHS counts nails becoming thicker as a normal part of getting older, so a thick nail on its own is not a reason to worry. It is worth getting checked if it changes quickly, changes colour, hurts, or if you do not know why it happened.

Treatment depends on the cause. A fungal infection needs an antifungal medicine from a pharmacist or GP. Whatever the cause, the nail itself can be kept comfortable by thinning and trimming it, which you can partly do at home with a file and which a Foot Health Practitioner or podiatrist can do more thoroughly. If you have diabetes, poor circulation, or take blood thinners or steroids, get professional help rather than tackling it yourself.

Onychauxis and onychogryphosis: two kinds of thick nail

Doctors use two names for thick nails, and the difference is shape.

	Onychauxis	Onychogryphosis (ram's horn nail)
What it looks like	A thickened nail that keeps a fairly normal shape, often discoloured	A thick, overgrown nail that curves to one side, like a ram's horn or an oyster shell, mostly on the big toe
Linked to	Injury, pressure from shoes, toe and foot shape	Mainly nails not being cut often enough; also injury, bunions, shoe pressure
Possible problems	Pain, the nail lifting at the tip, more chance of fungal infection	Pain and, in a few people, the tissue under the nail dying from the pressure

The table draws on a 2005 review of nail disorders in older people, which defines onychauxis as a localised thickening of the nail plate and describes onychogryphosis as "ram's horn-like", mostly on the big toe, and "mainly due to infrequent cutting of the nails". A 2018 review adds that onychogryphosis is most common in older adults and in people who struggle with personal care, and can cause pain, further complications and cosmetic worries. Both are reviews rather than trials, so they describe the condition well but cannot tell us how common each cause is.

What causes thick toenails

Often more than one of these is at work at once. The NHS also points out that nail problems can sometimes be a sign of a longer-term condition, such as psoriasis, anaemia, thyroid problems or diabetes, which is one more reason to mention a nail that is changing to your GP.

Age

The NHS lists nails that "become thicker or break more easily (brittle) as you get older" among normal nail changes. The 2005 review says these age changes are thought to result from reduced circulation to the hands and feet.

Injury and pressure from shoes

An injury to the toe, such as stubbing it or dropping something on it, and repeated pressure from shoes are both linked to thick nails. The 2005 review names injury, toe and foot deformities such as bunions, and shoes that do not suit the foot as causes, and says pressure from footwear can change the direction a nail grows.

Fungal infection

The NHS describes a fungal nail as brittle, discoloured or thicker than usual, often white or yellow and crumbly. It becomes more common with age: a UK survey found 1.3% of people aged 16 to 34 had one, against 4.7% of those aged 55 and over. Our fungal nail infection guide covers treatment.

Psoriasis

The British Association of Dermatologists (BAD) says nail psoriasis affects about half of people with psoriasis, and lists "thickening and yellowing of the nails" among its signs, along with pitting, lifting and pink patches under the nail.

Poor circulation

The NHS lists "toenails that grow slowly or break easily" among the signs of peripheral arterial disease (PAD), where narrowed arteries reduce blood flow to the legs. The BAD notes that fungal nail infections are more common in people with poor circulation. Circulation also matters for treatment: the 2005 review warns that in older people with poor circulation and reduced feeling, infection and gangrene can set in, which is why careful nail care matters more for them.

Is it fungal? You cannot tell by looking

Many people assume a thick yellow toenail is fungal. It often is, but not always. The BAD says that "other nail problems, such as psoriasis, can look very similar to fungal nail infection", and a 1998 review in Clinical Microbiology Reviews lists psoriasis, lichen planus, ram's horn nail and nail injury as conditions that can be mistaken for it. The same review says an accurate diagnosis needs a laboratory test.

This matters because antifungal medicines treat fungus. They are unlikely to help a nail thickened by injury or pressure, and courses are long. If you are thinking about treatment, a GP can send a nail clipping to a laboratory; the BAD says results can take several weeks. A Foot Health Practitioner can trim and thin the nail either way, but cannot diagnose the cause.

Why thick toenails matter

A thick nail is more than a cosmetic worry for several reasons.

Pain and pressure. A thick nail sits higher, so the shoe presses on it. Both reviews above list pain, and the 2005 review says that in a few people the pressure of a ram's horn nail causes the tissue underneath to die (gangrene).
More infections. The 2005 review says a thickened nail can lift at the tip and is more open to fungal infection, so one problem can lead to another.
Shoes. A raised or curved nail can make ordinary shoes uncomfortable, and the NHS advises against shoes that pinch your toes.
Hard to cut. The 2005 review notes that nail care becomes difficult for older people because of the thickness of the nails and difficulty reaching the feet. The NHS suggests seeing a podiatrist if "your nails are too tough to cut or you cannot reach them".
Falls. Age UK says foot problems can affect your balance and increase your risk of falling. In a 2018 review of 15 studies, older people with foot pain had about twice the odds of being fallers (odds ratio 1.95). That is an association, not proof that foot pain causes falls.

We found no study that measured thick toenails, or nail care on its own, against falls. The closest is a 2011 trial in the BMJ of 305 older people with disabling foot pain: a podiatry programme of insoles, footwear advice, foot exercises and routine podiatry led to 36% fewer falls than routine podiatry alone. Nail care was part of routine care in both groups, so the trial does not tell us what nail care alone does. The fair reading is that painful feet and falls go together, and keeping feet comfortable is sensible.

Safe home care for thick toenails

If you are generally well, can see and reach your feet comfortably, and do not have diabetes, poor circulation, or take blood thinners or steroids, these steps are safe to try. They come from the Royal College of Podiatry, the NHS and an NHS podiatry leaflet from Guy's and St Thomas'.

Soften first. Cut after a bath or shower. The Royal College of Podiatry says the nail is much softer then.
Thin the top with a file. The Royal College of Podiatry says: "If your nails are thick you can use a nail file on top of the nail to thin them down." Take a little off at a time and stop if it becomes sore.
Use nail nippers, not scissors. The College recommends nippers, which have a small cutting blade, because curved nail cutters can cut the skin and scissors can slip.
Cut straight across. Follow the natural shape of the nail, do not cut too short, and do not cut down the sides, which can leave a spike that grows into the skin.
File the edges smooth. If cutting is too hard, the Guy's and St Thomas' leaflet suggests filing twice a week instead.
Give your toes room. The NHS advises against shoes that pinch your toes.

While you are there, look at the skin around the nail and between your toes. If you cannot see your feet easily, Diabetes UK suggests using a mirror while sitting or lying down, or asking someone to check for you.

Do not dig under the nail with sharp objects, which the NHS advises against, and do not try to cut through a very thick nail in one go. The College's rule is simple: toenails should never be painful. If yours are, or are changing colour, it advises getting professional advice.

Who should not do this at home: the Royal College of Podiatry advises that people with diabetes, or who take steroids or anticoagulants (blood thinners), should not cut their own nails or remove ingrowing spikes themselves, and its leaflet for people with diabetes at high risk says not to cut your toenails unless your podiatrist advises you to. More on this in how to cut toenails properly.

Professional nail reduction: what happens

Nail reduction means trimming a thick nail to a comfortable length and thinning it down. The 2005 review describes the usual approach for both kinds of thick nail: periodic thinning of the nail with an electric drill or burr. It needs repeating, because the nail keeps growing. How often depends on how fast your nails grow: toenails grew about 1.6 mm a month in a study of healthy young adults, and the Guy's and St Thomas' leaflet suggests cutting toenails every 6 to 12 weeks.

The BAD fungal nail leaflet says that thinning, trimming or filing nails removes infected material and makes nails more comfortable, and suggests seeking treatment from a podiatrist if thickened toenails cause discomfort when walking.

Some options are only for doctors and podiatrists. The 2005 review mentions removing the nail, with or without stopping it growing back, for people with good circulation; the BAD mentions softening a nail with a strong urea paste before removal. These are medical procedures, not part of a Foot Health Practitioner's work. Our guide to the difference between a Foot Health Practitioner and a podiatrist explains who does what.

Where to get it

NHS podiatry. The NHS says some GPs can refer you, and in some areas you can refer yourself. It is not available to everyone; Age UK says you may be able to have routine NHS podiatry if your foot condition affects your health or mobility.
Age UK. Over 80 local Age UKs have trained workers who offer basic foot care such as toenail cutting, for older people who cannot look after their feet. There may be a charge.
Privately. From a podiatrist or a Foot Health Practitioner.

When to see a GP

See a GP if:

a nail has changed shape, changed colour or fallen off and you do not know why (NHS)
the skin around the nail is sore, red, swollen and warm (NHS)
you think it is a fungal infection and you have diabetes or a weakened immune system, or it has spread to other nails (NHS)
you have signs of poor circulation, such as leg pain when walking that eases with rest, cold feet, or sores on the feet that do not heal (NHS PAD page)

If you have diabetes, any change in your feet is worth reporting promptly; see our diabetic foot care guide. For older relatives who are struggling with their feet, our guide to foot care for older people covers the wider picture.

How we checked

On 10 November 2026 we read the NHS pages on nail problems, fungal nail infection and peripheral arterial disease; the British Association of Dermatologists' leaflets on fungal nail infection and psoriasis; Royal College of Podiatry patient advice; an NHS trust podiatry leaflet; and Age UK's foot care pages. For definitions and causes we used two peer-reviewed reviews of onychauxis and onychogryphosis, and for falls a 2018 systematic review and a 2011 randomised trial, read through Europe PMC. One review of nail changes in older people could not be opened in full, so we did not use it.

We did not use clinic or product pages. Where we found no evidence, for example on thick nails and falls, we say so. This guide is general information, not a diagnosis. If you are worried about your feet, see a GP, a pharmacist or an NHS podiatrist.

Where Fairy Feet fits

Marianna Tapai FHP is a qualified Level 4 Foot Health Practitioner who has worked with nails and feet since 2006. Thinning and trimming thick toenails is part of her Foot Health Treatment / Medical Pedicure (£39.99). If the nail may be fungal, there is Fungal Nail Advice and Treatment, and if a nail is damaged and you want it to look better, Cosmetic Toenail Reconstruction. If getting to the studio is hard, there is a call-out (home visit) option too.

Marianna is a Foot Health Practitioner, not a podiatrist. She does not diagnose the cause of a thick nail, prescribe, or remove nails. See a GP first if a nail has changed and you do not know why, if the skin around it is red, hot or swollen, or if you have signs of poor circulation. If you have diabetes and are at high risk, an NHS podiatrist is usually the right person; Marianna offers a Diabetic Foot Health Consultation, but where your diabetes foot team is the safer choice, that is where to go.

To ask a question or arrange a visit, use the form on the contact page; there is no online booking.

Get in touch Treatments and prices

Questions people ask

Are thick toenails always a fungal infection?

No. Age, injury, pressure from shoes, psoriasis and poor circulation can all thicken nails, and the British Association of Dermatologists says psoriasis can look very similar to a fungal infection. A GP can send a nail clipping to a laboratory to check before you start a long course of treatment.

Can I thin a thick toenail myself?

The Royal College of Podiatry says you can use a nail file on top of a thick nail to thin it, ideally after a bath when it is softer. Take a little off at a time and stop if it becomes sore. If you have diabetes, poor circulation, or take steroids or blood thinners, get professional help instead.

What is a ram's horn nail?

It is the common name for onychogryphosis, a thick, overgrown nail that curves to one side, usually on the big toe. Reviews link it mainly to nails not being cut often enough, along with injury and pressure from shoes. It is most common in older people and can be painful; regular thinning and trimming of the nail is the usual approach.

Can I get thick toenails cut on the NHS?

Sometimes. The NHS says some GPs can refer you to a podiatrist and in some areas you can refer yourself, but it is not available to everyone. Age UK says over 80 local Age UKs offer basic toenail cutting for older people, and there may be a charge.

Why are my toenails getting thicker as I get older?

The NHS lists nails becoming thicker with age as a normal change, and one review links this partly to reduced circulation. Fungal infection also becomes more common with age, so it is worth having a nail checked if it changes colour or crumbles.

Sources

Nail problems. NHS, checked 10 November 2026.
Fungal nail infection. NHS, checked 10 November 2026.
Peripheral arterial disease (PAD). NHS, checked 10 November 2026.
Fungal nail infections (patient information leaflet). British Association of Dermatologists, updated April 2026, checked 10 November 2026.
Psoriasis: an overview (patient information leaflet). British Association of Dermatologists, updated August 2023, checked 10 November 2026.
Nail changes and disorders among the elderly (Singh, Haneef and Uday). Indian Journal of Dermatology, Venereology and Leprology, 2005.
Onychogryphosis: case report and review of the literature (Ko and Lipner). Skin Appendage Disorders, 2018.
Onychomycosis: pathogenesis, diagnosis, and management (Elewski). Clinical Microbiology Reviews, 1998.
Prevalence of dermatophyte onychomycosis in the United Kingdom: results of an omnibus survey (Roberts). British Journal of Dermatology, 1992.
Foot problems as a risk factor for falls in community-dwelling older people: a systematic review and meta-analysis (Menz, Auhl and Spink). Maturitas, 2018.
Effectiveness of a multifaceted podiatry intervention to prevent falls in community dwelling older people with disabling foot pain: randomised controlled trial (Spink and others). BMJ, 2011.
Fitter feet. Age UK, checked 10 November 2026.
Foot care services in your area. Age UK, checked 10 November 2026.
General foot health advice for people with a rheumatic condition. Royal College of Podiatry, checked 10 November 2026.
Ingrowing toenail. Royal College of Podiatry, checked 10 November 2026.
High risk of non-healing wounds and amputation. Royal College of Podiatry, February 2026, checked 10 November 2026.
Growth rate of human fingernails and toenails in healthy American young adults (Yaemsiri and others). Journal of the European Academy of Dermatology and Venereology, 2010.
How to look after your feet. Diabetes UK, reviewed November 2024, checked 10 November 2026.
Caring for your feet and toenails. Guy's and St Thomas' NHS Foundation Trust, reviewed July 2026, checked 10 November 2026.