Nail Ridges: Causes, Deficiencies, and When to See a Dermatologist

Nail ridges are the lines or raised grooves that make the nail surface feel less smooth. They can run vertically, from the base to the tip, or horizontally, crossing the nail from side to side. In most cases-particularly when they are subtle vertical lines-they are not a sign of anything serious. Even so, sudden changes, deep grooves, or ridges accompanied by pain, colour change, or increased brittleness should be taken seriously.

Why do vertical ridges appear on nails?

Vertical ridges are the most common type. They often become more noticeable over the years because nails undergo natural age-related changes, much like skin and hair. In this situation, the surface may look lightly marked, without pain and without any major change in colour.

Aside from ageing, frequent hand dryness, repeated exposure to cleaning products, harsh removers, and a lack of moisturising can make nails more fragile and give them a ridged appearance. Generally, when the ridges are fine and show up across several nails at the same time, the cause is usually harmless.

When are horizontal ridges more concerning?

Horizontal ridges deserve closer attention, especially if they are deep or appear suddenly. They can develop when nail growth is temporarily disrupted due to physical stress on the body or injury to the nail matrix.

These marks-known as Beau’s lines-may appear after a high fever, infections, significant illnesses, knocks, surgery, periods of intense stress, or nutritional changes. Because nails grow slowly, the line may only become visible weeks after the event that interrupted growth.

Which deficiencies can affect the nails?

Nail appearance can also reflect a lack of certain nutrients, although you cannot diagnose a deficiency simply by looking at the nails. Very delicate nails that snap easily, peel, or change shape can be linked to nutritional shortfalls or underlying health issues.

• low iron can make nails weak and, in some cases, misshapen;
• insufficient protein intake can impair nail formation;
• zinc deficiency can affect growth and strength;
• a lack of B vitamins can impact overall nail health;
• very restrictive diets can leave nails more fragile.

Even so, it is best not to start supplements on your own. If a deficiency is suspected, tests and a professional assessment help confirm the true cause.

Can everyday habits also cause ridges?

Yes. Nails can be affected by small, repeated forms of damage. Over-filing, frequently removing cuticles, wearing false nails without breaks, applying nail polish continuously, and handling chemicals without gloves can weaken the surface and leave visible marks.

Another common habit is using nails as tools to open packaging, scrape surfaces, or pick at objects. This kind of minor-looking trauma can still affect the matrix or the nail plate and encourage irregular growth.

When should you see a dermatologist?

It is advisable to seek an assessment if ridges appear suddenly, become deep, affect only one nail, or come with pain, swelling, colour changes, dark patches, lifting, bleeding, or progressive deformity. These signs can point to anything from injury to infections, psoriasis, anaemia, hormonal changes, or other conditions that require specific care.

What matters most is the overall picture. Subtle vertical ridges can be part of natural ageing or dryness. Deep horizontal lines, rapid changes, or ridging alongside other symptoms are more likely to need investigation. Moisturising the nails, protecting hands from harsh products, and maintaining a balanced diet can help, but when changes fall outside the usual pattern, the correct diagnosis should be made by a professional.