If you're looking closely at your nails and wondering what those ridges, that peeling, or those white spots mean, you're not alone. Nails change shape, texture and colour for all sorts of reasons, and most people have no idea which changes are normal and which are worth paying attention to.
The good news is that most nail changes fall into a handful of recognisable patterns, each with a fairly specific cause. Here's what's usually behind the most common ones, and what actually helps.
Longitudinal Ridges
Fine lines running from cuticle to tip, sometimes called vertical ridges, are the most common nail change people notice, and in the vast majority of cases they're simply a normal part of ageing, becoming more pronounced from your 30s and 40s onward.
Unlike some of the other changes here, longitudinal ridging mostly comes down to the nail matrix, the area under the cuticle where new nail is produced, rather than the visible nail plate itself. As the matrix ages, the surface it lays down becomes less even, and that unevenness simply grows out with the nail — similar in principle to how skin loses some smoothness with age. Localised matrix injury can produce a similar single ridge on one nail.
Because the root cause sits at the matrix, a topical treatment generally can't fully resolve it, and it's realistic to expect ridging to be a permanent feature rather than one that disappears. That said, dehydration can make existing ridges look more pronounced and more prone to catching, so keeping nails well hydrated tends to make them somewhat less noticeable day to day.
Horizontal Ridges (Beau's Lines)
Beau's lines are indentations running across the width of the nail, formed when something temporarily interrupts growth at the matrix — a significant illness, major physical stress, a nutrient deficiency, chemotherapy, or local trauma. Since nails grow at a predictable rate, the position of a Beau's line can even give a rough idea of when the disruption happened. One that appears after a known illness and grows out is usually nothing to worry about; recurring lines, or ones without an obvious trigger, are worth mentioning to your doctor.
Peeling and Splitting Layers (Onychoschizia)
Peeling or delamination, where the nail separates into thin layers at the tip (black arrows in the picture above), comes down to the same three things behind most nail fragility: repeated wetting and drying, loss of the lipids that hold moisture in, and weakened bonds between keratin layers. Frequent hand-washing, dishwashing, gel and acrylic removal, and acetone-based removers are the usual culprits — each cycle strips a little more moisture and protective barrier, and once layers start separating, the nail catches more easily and the peel worsens.
This is one of the more fixable patterns, since it responds well to restoring hydration and reinforcing keratin cross-linking with consistent use of an absorption-based treatment, rather than a coating.
Pitting
Small, shallow depressions scattered across the nail happen when cells at the matrix are disrupted early in the nail-forming process, most commonly linked to psoriasis and less often to other inflammatory skin or scalp conditions. This is one of the few changes here that's genuinely worth a conversation with your doctor, particularly alongside skin changes, scalp flaking, or joint discomfort — a topical treatment isn't designed to address a cause that sits this far back in how the nail is made.
Spoon-Shaped Nails (Koilonychia)
Nails that curve upward at the edges into a concave shape are known as koilonychia. It's a normal variant in infants, but in adults it's classically associated with iron deficiency, and sometimes thyroid conditions. It develops gradually enough that people often don't notice until someone points it out. If your nails have taken on this shape, it's worth getting iron studies done, especially alongside tiredness, pallor, or hair thinning — the fix here starts with identifying and correcting the cause, not with a topical product.
White Spots or Patches (Leukonychia)
Despite the old wives' tale, white spots are almost never a sign of calcium or zinc deficiency. Small spots (leukonychia) are almost always caused by minor trauma to the matrix — an accidental knock, or a manicure pushing the cuticle back too firmly — and simply grow out over the following months. Larger patches, or whole-nail discolouration, are less common and worth mentioning to a doctor.
Yellowing
Yellowing usually has one of two explanations. Far more commonly, it's external staining from repeated dark polish without a base coat, which is superficial and grows out or buffs away. Persistent yellowing that doesn't improve, especially with thickening or a crumbly texture, can point to a fungal infection, which needs assessment rather than a strengthening product.
When It's Worth Seeing a Doctor
Most changes above are either normal ageing or temporary and self-resolving. Worth a proper conversation with your GP: pitting alongside skin or scalp changes, a spoon-shaped nail, persistent thickened yellowing, changes arriving alongside fatigue, hair thinning, or unexplained weight change, or any single nail that's changed differently from the rest.
What Actually Helps the Fixable Changes
Of the changes covered here, peeling responds best to a proper nail-strengthening routine, since it comes down largely to hydration and keratin structure within the nail plate. Longitudinal ridging is more realistically managed than reversed, though good hydration can still soften how noticeable it looks. Dr Tom Nailcare's formula uses hydrolysed New Zealand wool keratin, developed to restore hydration and reinforce keratin fibres from within the nail rather than coat the surface.
In lab testing, the cream made lab nails 30% stronger in 10 days, and the combination treatment made lab nails 78% stronger in 2 weeks. In consumer testing, 95% of users reported stronger, healthier, more flexible nails with the cream, and 100% reported improvement with the combination treatment.
Frequently Asked Questions
Are nail ridges a sign of a vitamin deficiency?
Usually not — longitudinal ridging is most often just the nail matrix ageing. Deficiency-linked changes, like spoon-shaped nails from iron deficiency, tend to come with a more specific shape change rather than fine surface ridges.
Can nail ridges be smoothed out permanently?
Not fully, since they're produced at the matrix rather than the visible nail plate. Buffing reduces their appearance temporarily but thins the nail. Good hydration won't change what the matrix is producing, but it can make ridges somewhat less noticeable and less prone to catching.
Why do only some of my nails look different from the others?
A single affected nail is more likely to reflect localised trauma than a whole-body cause, since systemic factors like nutrition, hormones, or thyroid tend to affect all nails fairly evenly.
How long does it take for a nail change to grow out?
Fingernails grow at roughly 3mm a month, so a fully new nail takes around 3 to 6 months — a change near the cuticle now will still be visible near the tip for several months yet.
Should I stop using nail polish if I notice these changes?
Not necessarily, but a break from dark polish without a base coat helps distinguish staining from other causes, and acetone-free removers are gentler on already-fragile nails.
The Takeaway
Most nail changes are ordinary and nothing to worry about — but knowing which pattern you're looking at makes it easier to know whether it's worth a doctor's visit or simply a sign your nails need better daily support. For the changes that come down to hydration and keratin structure, Dr Tom Nailcare's lab-tested formula is built to address the cause, not just the appearance.
Please note, the above is general information only and not a substitute for individual medical advice.