Yellow nails are not a disease in themselves: they are a signal. In most cases the colour comes from outside, from polish or tobacco, and it goes away on its own with a few weeks off and a good manicure. In others, especially on the feet, the yellow warns of a fungus that needs treating. Here is how to tell them apart and what to do in each case.
Why nails turn yellow
The most common cause of yellow nails is staining from polish: pigments, especially reds and dark shades, soak into the top layer of the nail when applied without a base coat. After that come tobacco, fungi and, far less often, some health conditions.
Polish without a base coat
If you have worn colour non-stop for months and the nail is yellowish but smooth, thin and odourless once you remove it, it is almost certainly staining. It does not hurt, does not thicken the nail and grows out. A clear base coat under the colour prevents it almost entirely.
Tobacco
Nicotine and tar stain the skin and the nails of the hand that holds the cigarette. It usually affects the index and middle fingers most, and shows on the fingertip too.
Fungus (onychomycosis)
A fungus gives a duller yellow, sometimes with white or brown patches, and the nail becomes thick, crumbly or lifts away from the bed. It is far more common on the feet, because of closed shoes and moisture. Polish and home remedies will not shift it: you need an antifungal and, sometimes, a podiatrist or dermatologist.
Other, less common causes
Psoriasis, thyroid problems, some medicines or simply age can yellow every nail on the hands and feet at once. If the colour appears on all your nails for no obvious reason, check with your doctor.
How to tell what you have: polish or fungus
Look at three things: thickness, smell and the way it spreads. This table helps you tell them apart.
| What to check | Polish staining | Fungus |
|---|---|---|
| Colour | Even, light yellow | Dull yellow, with white or brown patches |
| Thickness | Normal, smooth nail | Thick nail that crumbles |
| Where | Mostly on the hands | Mostly on the feet |
| How it changes | Grows out with the nail | Spreads from the edge towards the root |
| Smell | None | Sometimes unpleasant |
| What to do | A break and a base coat under colour | Antifungal and professional advice |
How to remove yellow from your nails at home
If it is staining, the yellow fades or goes in two or three weeks by combining a break from polish, a very gentle buff and a mild home brightener. What you must not do is file the surface hard: the nail weakens and the problem comes back worse.
- Leave the nail bare for at least two weeks. In the meantime use only a base coat or a strengthener.
- Baking soda and hydrogen peroxide paste. Mix a tablespoon of baking soda with half a tablespoon of 3% hydrogen peroxide, apply it to the nail, leave it for three minutes and rinse. Once a week, no more.
- Lemon. Rub half a lemon over the nails for two minutes, rinse and moisturise. It is gentler than baking soda and good for maintenance.
- Fine-grit buffer. A couple of passes with a four-sided buffer, only on the stained area and without pressing.
- Cuticle oil every night. A hydrated nail holds less pigment.
If there is no improvement after a month, or the nail thickens, book an appointment: we will take a look and, if needed, refer you to a podiatrist.
Yellow toenails
On the feet, yellow nails are a fungus until proven otherwise: the foot is enclosed, it sweats, and that is the perfect environment for fungi to grow. If the nail is also thick or breaking, start with an over-the-counter topical antifungal and keep the foot dry with clean socks every day.
When it is not a fungus, a pedicure with heel work and a buff leaves the nail clean, and polish over a base coat protects it. At the salon, if we see signs of infection we do not paint over it: we tell you and recommend treating it first.
How to stop them turning yellow again
- Always a base coat under any colour, on the feet too.
- Take a break from colour for a week or two every two or three months.
- Remove polish properly. Peeling or scraping off gel polish leaves the nail porous and it stains more. If you wear it, here is how to remove gel polish without damaging the nail.
- Moisturise the cuticle and avoid pure acetone, which dries the nail out.
- Dry feet: change socks daily and let trainers air out.
What we do about yellow nails at the salon
At nails and the city we start by looking at the nail: if it is staining, we buff gently, moisturise and suggest a colour over a base coat that will not stain again. With the Russian manicure we work the cuticle dry and leave a clean outline, so the nail looks good even without colour. If we suspect a fungus we tell you and do not paint over it: the health of the nail comes first.
You can book your appointment through Treatwell or write to us and we will advise you.
Frequently asked questions
Do yellow nails go away on their own?
If the yellow comes from polish or tobacco, yes: it disappears as the nail grows, in about six to eight weeks on the hands and up to twelve months on the feet, which grow more slowly. If it is a fungus it will not go on its own and needs treating.
Can I wear polish if my nails are yellow?
If it is staining, yes, always with a clear base coat underneath. If you suspect a fungus, better not: polish traps moisture and makes the infection worse. Treat it first.
How long does it take for baking soda or lemon to work?
You will notice a difference from the first application, but the colour only goes completely once the stained nail grows out and is trimmed, after two or three weeks of weekly use. Do not use it more than once a week: it dries the nail.
Why do only my toenails turn yellow?
Because the foot is enclosed and damp, the ideal environment for fungi, and because toenails grow more slowly and hold on to any staining for longer. If the nail is thick, see a podiatrist.
Can you remove the yellow at the salon?
If it is staining, yes: with a gentle buff, hydration and a colour over a base coat that will not stain again. If we see signs of a fungus we tell you and recommend treating it before any polish.