Foot Care By Nana · 6 min read

Nail fungus on the foot: recognise, treat and prevent it

Note: This article contains affiliate/advertising links. As an Amazon Associate we earn from qualifying purchases. If you click such a link and buy something, we may receive a small commission – at no extra cost to you.

Nail fungus on the foot is widespread and usually harmless, but persistent: discoloured, thickened or brittle nails rarely disappear on their own. The earlier you react, the more straightforward treatment usually is. This article explains factually how to recognise nail fungus, how it differs from athlete’s foot, which treatment options exist and how to prevent it. It is for general information and is not a substitute for a medical diagnosis – with unclear or advanced changes, the nail belongs in expert hands.

Recognising nail fungus

Nail fungus (onychomycosis) usually develops slowly and painlessly. Typical signs are:

• Discolouration: The nail becomes yellowish, whitish or brownish, often starting at the edge.
• Thickening: The nail plate becomes thicker and uneven.
• Brittleness: The nail becomes crumbly, splinters or partly detaches from the nail bed.
• Loss of shine: The surface looks dull and matte.

Since other causes can look similar, a reliable diagnosis should be made medically – usually via a swab or a sample.

How nail fungus develops

Nail fungus is usually caused by filamentous fungi (dermatophytes), more rarely by yeasts or moulds. They are especially comfortable in a warm, damp environment and enter the nail through small injuries. Contributing factors include:

• Moisture in the shoe: Sweating or feet that are not dried properly create ideal conditions.
• Injuries to the nail: Pressure points, bruised nails or untidy trimming offer entry points.
• Shared areas: Swimming pools, saunas and changing rooms are typical places of infection.
• Weakened defences or pre-existing conditions: Circulatory problems or diabetes, for example, increase the risk.

Knowing these factors makes it possible to prevent more specifically – more on this below.

Distinguishing: nail fungus or athlete’s foot?

The two are often confused but affect different areas:

• Athlete’s foot affects the skin, especially between the toes: itching, redness, scaling and small cracks.
• Nail fungus affects the nail itself: discolouration, thickening, brittleness.

Often an untreated athlete’s foot spreads to the nails. Anyone who cares for the skin early also helps prevent nail fungus – see Preventing athlete’s foot.

Treatment options

How it is treated depends on the extent and, if you are unsure, belongs in medical hands. In principle, a distinction is made between:

1. Topical treatment: With mild involvement of individual nails, special products to apply may be an option. They require patience, as the nail grows out slowly.
2. Systemic treatment: With extensive or persistent involvement, a doctor-prescribed therapy may be necessary. The treating practice decides on suitability and possible interactions.
3. Accompanying measures: Affected parts of the nail can be removed by a professional (e.g. podiatrist). More on the difference between treatment forms under Medical vs. cosmetic foot care.

Important: treatment often takes months, because the healthy nail has to grow back completely. If stopped too early, the fungus easily returns.

What supports the treatment

Regardless of the chosen path, a few habits help not to jeopardise success:

• Consistency and patience: Keep up the application for the entire recommended period, even when the nail already looks better.
• Separate and clean tools: Use your own files and scissors for affected nails and keep them clean, so as not to infect other nails.
• Treat shoes and socks: Wash socks hot and let shoes dry well, so that no spores survive.
• Keep nails short: Regular, straight trimming reduces the affected nail mass – see Cutting toenails correctly.

Prevention

Nail fungus can often be avoided with simple habits:

• Keep feet dry: Dry thoroughly after washing, especially between the toes.
• Breathable shoes and socks: A warm, damp climate in the shoe favours fungi.
• Your own towels and shoes: Fungi are easily transmitted, for example in swimming pools or saunas – it is best to wear bathing shoes there.
• Care for the nails: Trim cleanly and straight, as described under Cutting toenails correctly, and pay attention to clean tools.
• Change and air out shoes: Don’t wear the same pair every day, but let shoes air out and dry through.
• Mind the skin: Care for dry, cracked skin so that germs find no entry point – tips are given under Applying foot cream correctly.

Anyone who has already had athlete’s foot in particular should prevent consistently, because a renewed skin fungus can easily spread to the nails again.

When to see a doctor?

Medical advice is advisable when:

• the diagnosis is unclear or the nail changes noticeably,
• several nails are affected or the involvement progresses,
• topical treatment brings no improvement over weeks,
• or pre-existing conditions such as diabetes are present. Particular caution is then required – see Foot care with diabetes.

Frequently asked questions (FAQ)

Does nail fungus go away on its own?

As a rule, no. Untreated, it tends to spread further and can move to other nails. The earlier it is treated, the more straightforward it usually is.

How long does the treatment take?

Often several months, because the affected nail has to grow out completely. Patience and consistency are key – stopping too early often leads to a relapse.

Can I go to the swimming pool with nail fungus?

Fungi are easily transmitted on damp floors. Out of consideration and for your own protection, bathing shoes are sensible. The exact recommendation is best discussed with the treating practice.

Is nail fungus contagious?

Yes. The pathogens can be transmitted via shared towels, shoes, nail scissors or damp floors – also within the family. Your own care utensils, separate towels and treating an infection early reduce the risk of infecting others or further nails of your own.

Do home remedies help against nail fungus?

For many popular home remedies there is no reliable proof of effectiveness, and some additionally irritate the skin. With a genuine fungal infection, there is usually no way around targeted treatment. When in doubt, the medical practice clarifies what makes sense – this article does not replace such advice.

Does this article replace seeing a doctor?

No. The information is for general guidance and does not replace a medical diagnosis or treatment. With unclear or progressing changes, you should seek medical advice.

↗ Share article