Understanding it
Can a fungal nail infection spread to other nails or people?
Yes — slowly, but reliably. Onychomycosis is mildly contagious, and the most common route of transmission is from your own foot skin to your own nails.
Summary
The same dermatophyte that causes athlete's foot causes most nail infections. Spores survive on floors, in socks and inside shoes for months, so untreated infection tends to move from skin to nail, nail to neighbouring nail, and occasionally person to person within a household.
How it travels
Contain these routes and the risk drops sharply.
- Bare feet on shared bathroom and bedroom floors
- Towels and bath mats shared within a household
- The same clippers or file used on infected and healthy nails
- Shoes and socks that never dry fully
- Untreated athlete's foot between the toes
Containment at home
Keep a separate clipper for the infected nail and disinfect it after each use, wash towels and socks at 60°C, wear flip-flops in shared showers, and treat any athlete's foot at the same time as the nail.
When to seek medical advice
Get advice if infection spreads to several nails within a few months, or if anyone in the household is immunosuppressed or diabetic.
Frequently asked questions
Can it spread to my hands?
It can, usually through repeatedly touching or picking at an infected toenail. Wash hands after treating the nail.
Should I stop swimming?
No — just wear pool shoes and dry your feet properly, especially between the toes.
References
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Medical disclaimer. This article is general information written for a UK audience. It is not medical advice and does not replace assessment by a GP, pharmacist or podiatrist. Always read the patient information leaflet supplied with any product before use.