Fine vertical lines running across the nail surface, from the proximal nail fold to the free edge, are very common and often become more pronounced with age. In the vast majority of cases, these longitudinal ridges are nothing serious: they are due to a drier nail, repeated activities such as frequent contact with water, detergents or nail polish remover, or simply the natural aging of the nail matrix. Two specific causes, however, should be checked by a healthcare professional rather than guessed at by looking: iron deficiency and certain thyroid disorders can also thicken or ridge the nail, and only a blood test can confirm or rule them out.
- Fine, regular ridges on several nails that appear gradually are most often related to age or nail dryness rather than an illness.
- A new or changing ridge is worth mentioning to a doctor, especially if it comes with a change in the nail’s shape or color, small dents, or redness and swelling around the nail; a sudden appearance, a very pronounced ridge, pain or a ridge on just one nail are also reasons to consult a doctor as a precaution.
- Gently buffing the surface and moisturizing the nail and cuticle every day can reduce the appearance of ridges, without making them disappear if an underlying cause has not been treated.
- An opaque press-on nail set in a nude or light shade can visually smooth the look of the nail while any potential cause is being identified.
Why some nails develop ridges
The role of age and nail dehydration
As we age, the matrix that produces the nail makes keratin that is less well hydrated, and the nail surface shows this in the form of fine vertical ridges; this is a common phenomenon and is harmless in itself (source: Cleveland Clinic). Very dry skin or hand eczema can have the same effect, because the nail becomes dehydrated along with the surrounding skin (source: Cleveland Clinic). Hands that are often immersed in water, exposed to household products or cleaned with acetone become dry more quickly, which explains why ridges sometimes become more visible after a period of frequent manicures or repeated housework.
Deficiencies and thyroid disorders: a real link, but one that needs to be confirmed
Iron deficiency is one of the identified causes of vertical ridges and, in more pronounced cases, can cause spoon-shaped nails (koilonychia); a blood iron test can confirm it, rather than relying on observation alone (source: Cleveland Clinic). A thyroid disorder can also thicken the nail, make it brittle and leave visible ridges, often alongside other changes such as faster or slower nail growth, or a nail that crumbles or lifts (source: American Academy of Dermatology). These two possibilities should be checked by a doctor: the appearance of the nail alone cannot diagnose either a deficiency or a thyroid disorder.
What is generally harmless, and what should prompt you to see a doctor
Most ridges fall into the first group below. The second group lists signs that call for medical advice rather than simply monitoring them at home.
- Generally harmless: fine ridges on several nails that have appeared gradually, particularly with age, dry skin or frequent manicures, and that do not change the nail’s color or shape.
- Have a doctor check it: Cleveland Clinic recommends always telling your doctor about a new or changing ridge, and specifically lists certain signs to mention: a change in the nail’s shape (a spoon-shaped nail or a club-shaped nail, known as “clubbing”), a change in color (white, green, yellow or a darker mark), small regular dents (pitting), or redness and swelling around one or more nails (source: Cleveland Clinic). As a general precaution, a ridge that appears suddenly, becomes very pronounced, comes with pain, or affects just one nail is also worth reporting promptly, even if it does not fit these specific criteria. If the mark you are concerned about is more of a whitish discoloration, the article on white spots on nails covers that specifically.
A brown or black ridge (a pigmented band on the nail) is different from a simple ridge and should not be assessed in the same way: reference sources used by dermatologists note that a band wider than about 3 mm, one that darkens or widens quickly, or one whose pigmentation extends onto the skin of the nail fold (Hutchinson’s sign) should be examined promptly by a doctor (source: MSD Manual, Professional Edition). This guideline concerns nail pigmentation, not an ordinary ridge, and it is not a diagnosis to make yourself at home. Similarly, a nail that gradually separates from the nail bed is a different situation, covered in the article on a nail lifting from the nail bed: a doctor is still the right person to confirm or rule out a deficiency or thyroid disorder, since the appearance of the nail alone is not enough to determine the cause.
Simple care for less ridged nails every day
- Lightly buffing the nail surface with a fine-grit file, always in the same direction, can reduce a superficial ridge without weakening the nail, as long as you do it gently and only occasionally.
- Applying oil or moisturizer to the nail and cuticle every day helps limit the dryness that makes ridges more noticeable.
- Spacing out gel or acrylic applications and wearing gloves for washing dishes or cleaning reduces repeated dehydration, which makes ridges more visible.
These steps can improve the appearance of the nail but will not remove a ridge caused by an untreated underlying condition; they work best once a doctor has ruled out a cause that requires treatment (source: Cleveland Clinic).
Camouflage ridged nails with a press-on nail set
While you wait to see a doctor, or simply to smooth the look of your nails day to day, an opaque, evenly pigmented shade covers a textured nail better than a semi-transparent polish or a very glossy, light finish, because it does not let the texture of the natural nail show through. The Nude set, in a ballerina shape with a glossy finish, works on this principle: the warm beige shade is applied evenly over the entire surface, masking the texture rather than highlighting it.
Apply the set using the same steps listed on the product page, whether your natural nail is smooth or ridged: choose the right size for each nail from the 12 to 15 sizes provided, prepare the surface with the included file and alcohol wipe, then attach the nails using the 2 g of glue included in the box. Application at home takes about ten minutes, and wear lasts up to about two weeks, depending on nail preparation and daily activities (contact with water, cleaning or repeated movements); the reusable nails in the kit can be used again for another application. For a lighter shade than Nude’s beige, the Milky shade covers the nail using the same opaque principle.
A press-on set is a cosmetic covering and does not treat or correct an underlying cause of ridges: it only evens out the appearance of the nail surface while it is being examined, if needed. Wearing one does not prevent a doctor from checking for a deficiency or thyroid disorder; simply remember to mention at your appointment how long the ridge has been there and whether its appearance has changed.
Keep the distinction in mind: fine, gradual ridges on several nails can be monitored without worry and camouflaged if needed, while a sudden appearance, pain, a ridge on just one nail or a change in color call for medical advice before any cosmetic treatment. More topics related to nail health are covered on the DIVAZ blog.