Fungal Toenails: How to Recognise Them and What Treatment Options Are Available?

Thick, discoloured or crumbling toenails are not just a cosmetic worry. A fungal nail infection can become uncomfortable, make shoes painful and spread to other nails if it is ignored. The encouraging news is that it can be managed with the right care. In this guide, the podiatry team at Sidcup Foot Clinic explains how to recognise fungal toenails, what causes them and which toenail fungus treatment options are available.

What is a fungal toenail infection?

A fungal nail infection (onychomycosis) happens when microscopic fungi, most often the same type that causes athlete’s foot, get into or under the nail. Warm, damp conditions help fungi thrive, which is why toenails are affected far more often than fingernails. Because toenails grow slowly, an infection can take hold quietly and become stubborn.

How to recognise fungal toenails

Fungal nails often start with a small spot at the tip of the nail and gradually spread. Common signs include:

• A nail that turns yellow, white, brown or cloudy
• Thickened nails that are hard to trim
• Brittle, crumbly or ragged edges
• A distorted shape, or a nail lifting away from the nail bed
• Debris building up under the nail, sometimes with an unpleasant smell
• Mild discomfort or pain, especially when wearing shoes

Not every discoloured or thick nail is fungal. Injury, psoriasis and other skin conditions can look very similar, which is why a professional assessment matters before you start treatment.

What causes fungal nail infections?

• Athlete’s foot: the infection can spread from the skin to the nail.
• Warm, damp environments: sweaty feet, tight shoes and non-breathable socks.
• Communal spaces: swimming pools, gym changing rooms and shared showers.
• Nail damage: a knock, repeated pressure or injury can let fungus in.
• Shared items: nail clippers, files and towels, or untreated tools at nail salons.
• Health factors: age, diabetes, poor circulation or a weakened immune system raise the risk.

Fungal nail infection podiatrist: what to expect

A fungal nail infection podiatrist can look closely at your nails and feet, ask about your health and symptoms, and advise whether the changes are likely to be fungal. Where it is helpful, a small nail sample can be taken to confirm the cause before longer treatment begins. Your podiatrist will then explain the options that suit you and your lifestyle.

Fungal toenail treatment options

Professional nail care

Thickened nails can be painful and are hard to treat at home. Your podiatrist can carefully thin and reduce the nail, which eases pressure and discomfort and can help topical treatments reach the infection more effectively.

Topical antifungal treatments

Medicated nail paints, lotions and solutions are applied directly to the nail. They are often suitable for mild to moderate infections. Consistency is key: toenails grow slowly, so these treatments usually need to be used for many months.

Prescription tablets

For more severe or widespread infections, antifungal tablets may be suitable. These are prescribed by a doctor, so we may advise you to speak to your GP if your podiatrist feels this is the right route for you.

Foot hygiene and preventing re-infection

Treating the nail is only half the job. Treating athlete’s foot, keeping feet dry, and caring for socks and shoes help stop the infection from coming back.

Please be patient. A healthy new nail has to grow out completely, which can take 12 to 18 months for a toenail. Your podiatrist will guide you on what progress to expect.

Looking after your nails at home

• Wash and dry your feet thoroughly every day, especially between the toes.
• Wear clean, breathable socks and change them daily.
• Rotate your shoes and let them dry out fully between wears.
• Wear flip-flops in public showers, pools and changing rooms.
• Do not share towels, clippers or nail files.
• Trim nails straight across and keep them short.
• Avoid covering infected nails with nail polish, as it can trap moisture and hide changes.

When to see a podiatrist

Book an appointment if your nails are discoloured, thick or changing shape, if treatments from the pharmacy are not working, or if the nail is painful. Seek advice promptly if you have diabetes, poor circulation or reduced feeling in your feet, or if the skin around the nail is red, swollen or weeping. In these cases, even a small nail problem should be checked early.

Podiatrists are regulated healthcare professionals. You can find further foot health information from the Institute of Chiropody and Podiatry. Related reading: Ingrown toenails: causes, treatment and when to see a podiatrist.

Fungal toenail treatment in Sidcup

If you are looking for fungal toenail treatment in Sidcup, our specialist podiatrists are here to help. We will assess your nails, explain your options in plain language and put together a plan that fits you. Learn more about our fungal nail treatment service.

Frequently asked questions

Will a fungal toenail go away on its own?

Unlikely. Fungal nail infections tend to persist and can slowly get worse or spread without treatment.

Is a fungal nail infection contagious?

It can spread to other nails and, through shared surfaces such as showers and towels, to other people. Good foot hygiene lowers the risk.

How long does treatment take?

Because toenails grow slowly, it takes months for clear, healthy nail to replace the affected nail. Your podiatrist can give you a realistic timeframe after assessing your nails.

Can I paint over a fungal nail?

We advise against it. Polish can trap moisture and make it harder to see whether the nail is improving.

Book your fungal nail appointment in Sidcup

Do not wait for the problem to get worse. Our friendly, specialist team at Sidcup Foot Clinic is ready to help you get healthier, more comfortable nails. Book online or call us on 020 8302 5259.