Nails are easy to ignore until something goes wrong. They thicken, they yellow, they split, they become harder to cut, and most of us quietly put it down to getting older and leave it at that. Some of that is genuinely just ageing. Some of it is a treatable infection, a medication side effect, or occasionally something that needs a doctor’s opinion quickly. Knowing the difference is worth a few minutes of your time.
TL;DR
- Nail growth slows with age, so ridges, thickening and slower repair after damage are normal and not usually a health problem.
- Roughly half of thick, discoloured toenails are not fungal, so a nail sample should be taken before starting oral antifungal tablets.
- Fungal nail treatment is slow: about six weeks of tablets for fingernails and twelve for toenails, with the nail taking up to a year to look normal again.
- One red flag matters more than the rest: a new dark streak in a single nail, especially if the pigment spreads onto the surrounding skin. Get it checked.
- Podiatry is a CORU-regulated profession in Ireland. Chiropody is not a guaranteed medical card entitlement, and cover varies by HSE region, so ask locally.
- If you have diabetes, nail and foot care is a medical issue, not a cosmetic one. You are entitled to annual foot screening.
What changes, and why
Fingernails grow at roughly three millimetres a month, toenails at about one. Both slow gradually from your twenties onwards, which is why a bruised or damaged nail in your sixties takes considerably longer to grow out than it did in your thirties.
The nail plate also changes texture. Longitudinal ridging, those fine vertical lines running from cuticle to tip, is one of the most common age-related changes and is almost always harmless. Nails become drier and more brittle as the natural oils in the plate decline, and toenails thicken, partly from decades of pressure from footwear and partly from reduced circulation to the feet.
None of that needs treating. What needs attention is change that is sudden, one-sided, or painful.
The fungal nail question
Fungal nail infection, or onychomycosis, becomes considerably more common with age. Reduced circulation, slower nail growth and more years of exposure all play a part, and it is more likely again if you have diabetes or a long-standing athlete’s foot problem.
The classic picture is a toenail that turns yellow or brown, thickens, becomes crumbly at the edge and lifts away from the nail bed. Here is the part that catches people out: studies consistently find that only around half of nails that look fungal actually are. Nail psoriasis, repeated trauma from shoes, and simple age-related thickening all produce a very similar nail.
That is why a GP should take a nail clipping and send it for testing before prescribing oral antifungal tablets. Terbinafine, the usual first-line treatment, is taken for around six weeks for fingernails and twelve for toenails, and it is not a trivial medicine. It can affect liver function, so bloods may be checked, and it interacts with a number of commonly prescribed drugs. If you are on several medications already, this is a conversation worth having properly rather than reaching for something over the counter.
Manage your expectations on timing, too. Even when treatment works, the nail only looks normal once the healthy nail has grown all the way out, which can take nine to twelve months for a big toe. Recurrence is common, so keeping feet dry, treating athlete’s foot promptly and rotating footwear genuinely matters.
When a nail change needs a doctor
Most nail complaints are nuisances. A small number are not. See your GP without waiting if you notice:
- A new dark brown or black streak running down a single nail, particularly if it is widening or if the pigment extends onto the skin of the cuticle or nail fold. This can be a subungual melanoma, and it is the single most important nail sign to act on. Melanoma under the nail is uncommon but is often diagnosed late precisely because people assume it is a bruise.
- A nail that lifts, splits or deforms on its own, with no injury to explain it, especially if only one nail is affected.
- Swelling, heat and pain around the nail fold, which suggests infection and may need treatment.
- Sudden changes across all nails, such as spoon-shaped nails, which can accompany iron deficiency, or a marked change in nail shape and finger tip contour.
Horizontal grooves across the nails, known as Beau’s lines, are worth mentioning but rarely alarming. They mark a pause in nail growth during a significant illness, a hospital stay or a course of chemotherapy, and they simply grow out.
Medication, and the nails nobody connects
Plenty of routine medicines affect nails. Chemotherapy agents are the obvious example, but long-term steroid use, some antibiotics, retinoids and certain heart medications can all change nail texture or colour. If you are on blood thinners, small splinter-like marks under the nail after minor knocks are common and usually harmless. If you notice nail changes after starting something new, mention it: every community pharmacist in Ireland can carry out a free medicines review.
Practical care that actually helps
Cut toenails straight across rather than curving down at the corners, which is the main preventable cause of ingrown toenails. Do it after a bath or shower when the nail is softer. Use a proper toenail clipper rather than scissors, and file rough edges rather than tearing them.
For brittle nails, moisturising is more effective than supplements. A urea-based cream worked into the nail and surrounding skin at night helps considerably. The evidence for biotin supplements is thin, and they can interfere with thyroid and cardiac blood test results, which is a genuinely underappreciated problem. Leave cuticles alone: they are a seal against infection, not untidiness.
If you cannot comfortably reach your feet, do not improvise. Long-handled clippers, a long-handled mirror to inspect the soles, or help from a podiatrist are all better options than struggling. Never use over-the-counter corn or callus plasters if you have diabetes or poor circulation, as the acid in them can cause ulceration.
Getting help in Ireland
Podiatrists and chiropodists in Ireland treat nail and foot problems, and podiatry is regulated by CORU, so you can check that a practitioner is on the register before you book. Private treatment typically runs to a few tens of euro per session.
Public provision is patchier than people expect. Chiropody is not a statutory entitlement under the medical card, and whether it is funded, and for whom, varies between HSE regions. Contact your local health office to ask what is available in your area rather than assuming either way. Your public health nurse can also advise, particularly if mobility or eyesight makes foot care difficult at home.
If you have diabetes, the position is clearer. Foot problems are treated as a priority, you are entitled to annual foot screening, and there are established referral routes to specialist podiatry if you are assessed as being at moderate or high risk. Do not wait for a routine appointment if you spot a break in the skin, redness or a change in a toenail.
At Críonna Health we take the view that small, unglamorous things like toenails are exactly where independence quietly holds or slips. Being able to walk comfortably is not a minor matter, and a nail that has been left alone for two years is often the reason someone has stopped going out.
This article is for general information and is not a substitute for individual medical advice. Talk to your GP or pharmacist about your own circumstances.
📷 Photo by Hasan Hasanzadeh on Unsplash
