Are your nails ridged, brittle, splitting, or yellow? These signals have identifiable causes and concrete solutions. Here's how to understand what your nails are trying to tell you and restore healthy, strong nails.
March 5, 2026 · Updated April 26, 2026 · Nail Health
Nails are a reliable indicator of your health and habits. A nail that is ridged, brittle, splitting, or yellow is not inevitable: it's a signal. The cause is almost always identifiable, and the solution often simple.
This guide reviews the 4 most common nail problems, their real causes, and concrete steps to remedy them.
The 4 Most Common Nail Problems
📏 Ridged Nails
Fine vertical lines run across the nail from base to free edge. This is the most common and often least concerning problem.
Main causes: natural aging of the nail plate (vertical ridges are the "wrinkles" of the nail), chronic dehydration, repeated exposure to water and detergents. Horizontal ridges (Beau's lines) are rarer and indicate shock, intense stress, or recent illness.
Solutions: Daily hydrate nails and cuticles with oil (castor, jojoba, sweet almond). Wear gloves for washing dishes and cleaning. Avoid buffing the nail surface (this thins the keratin without eliminating the cause). If ridges are horizontal or appear suddenly, consult a dermatologist.
💔 Brittle Nails
Nails break easily, often at the slightest impact. The plate appears rigid, dry, and fragile.
Main causes: dehydration (water, solvents, acetone, household products), iron, zinc or vitamin B deficiencies (especially biotin/B8), repeated aggressive manicures (buffing, UV gel, semi-permanent). Winter cold and heating accelerate dehydration.
Solutions: Apply a nourishing oil to nails and cuticles morning and evening. Enrich diet with iron (red meat, lentils, spinach), zinc (seafood, pumpkin seeds), and biotin (eggs, nuts, avocado). Space out aggressive manicures. Wear gloves in cold weather. If fragility persists despite care, get a blood test (iron, ferritin, zinc).
📄 Splitting Nails
The nail separates into thin layers at the free edge, like pages of paper. Very common on fragile nails.
Main causes: repeated hydration/dehydration cycles (hands often in water then dry air), filing back and forth (vibrations separate keratin layers), clipping with nail clippers (causes micro-trauma), sulfur or calcium deficiency.
Solutions: Always file in one direction, never back and forth. Replace nail clippers with a fine-grit file (glass or cardboard). Limit prolonged contact with water (gloves). Apply a nail hardener or calcium base for a 4-week treatment. Keep nails short during regeneration.
🟡 Yellow Nails
The nail plate takes on a yellowish tint, sometimes unevenly. The nail can also become dull.
Main causes: repeated application of dark polish without a protective base coat (pigments migrate into the keratin), tobacco (nicotine stains the nail on contact), early fungal infection (yellowing + thickening + crumbly texture = consult a doctor), natural aging (slowing circulation).
Solutions: Always apply a clear base coat before colored polish. For whitening: a lemon bath (lemon juice + warm water, 10 minutes, once a week). For prevention: space out polish applications and leave nails bare regularly. If yellowing is accompanied by thickening or deformation, consult a doctor (suspected fungal infection).
The 5 Most Frequent Causes of Damaged Nails
1. Aggressive Manicures
This is the number 1 cause among women aged 25 to 45. Semi-permanent, UV gel, and acrylic involve buffing the nail surface, UV exposure, and acetone removal. Repeated every 2 to 3 weeks for months, these actions lead to progressive thinning of the nail plate, ridges, brittleness, and sometimes yellowing.
Peeling off semi-permanent or gel instead of having it professionally removed is even more destructive: the superficial layers of the nail come off with the product.
2. Prolonged Contact with Water
Water penetrates the keratin layers and causes them to swell. Upon drying, the nail contracts. This swelling/shrinking cycle, repeated daily (washing dishes, bathing children, cleaning), weakens the nail structure and causes splitting. The simplest and most effective solution: household gloves.
3. Nutritional Deficiencies
The nail is composed of 90% keratin, a protein whose synthesis directly depends on your diet. Certain deficiencies have recognizable signs on the nail:
| Deficiency | Nail Sign | Food Sources |
|---|---|---|
| Iron | Concave nails (spoon-shaped), ridged, pale | Red meat, lentils, spinach, tofu |
| Zinc | White spots, fragility | Seafood, pumpkin seeds, cashews |
| Biotin (B8) | Splitting into thin layers | Eggs, nuts, avocado, salmon |
| Calcium | Soft nails, splitting | Dairy products, almonds, broccoli |
| Sulfur | Soft and fragile nails | Garlic, onion, cruciferous vegetables, eggs |
4. Stress and Fatigue
Cortisol (the stress hormone) reduces peripheral blood circulation. Nails receive fewer nutrients, grow more slowly, and become weaker. An intense period of stress can cause horizontal lines (Beau's lines) to appear 2 to 3 months later, as the affected nail area grows to the visible edge.
5. Everyday Chemicals
Detergents, solvents, acetone-based removers, cleaning products: all dry out and weaken the keratin. Acetone is particularly aggressive. Household gloves and replacing acetone with a gentle remover make an immediate difference.
Good Practices and Mistakes to Avoid
- Hydrate nails and cuticles morning and evening (castor, jojoba, or sweet almond oil)
- Wear gloves for washing dishes and cleaning
- File in one direction only, with a glass or cardboard file
- Eat protein, iron, zinc, and biotin
- Leave nails bare for 24 to 48 hours between long manicures
- Use a protective base coat before any colored polish
- Thoroughly dry hands and nails after each wash
- Peel off semi-permanent polish or gel extensions
- Use nail clippers (vibrations cause splitting)
- File back and forth
- Regularly use pure acetone remover
- Buff the nail surface to hide ridges
- Consecutively apply semi-permanent polish without a break
- Keep hands in hot water for more than 10 minutes without gloves
Protecting Fragile Nails During Regrowth
Complete nail regrowth takes 3 to 6 months. During this period, the nail is vulnerable, and aesthetic results are not immediate. This is often when one is tempted to get semi-permanent or gel again "to hide the damage," which exacerbates the problem.
Reusable press-on nails offer an interesting alternative during this phase: they protect the nail from impacts and external aggressions, without any of the aggressive actions that weakened it in the first place. No buffing, no UV, no acetone. The nail grows and strengthens under the tip, protected.
Gel pads are the most suitable choice for fragile nails: removal leaves no residue and places no strain on the natural nail.
When to Consult a Doctor
Most nail problems can be resolved with good daily habits and a balanced diet. But certain signs require medical attention:
Consult a dermatologist if: the nail suddenly changes color (black, green, dark brown), thickens and becomes crumbly (suspected fungal infection), deforms (spoon-shaped nail, deep horizontal ridges), detaches from the nail bed, or if fragility persists despite 3 months of care and a balanced diet.
A blood test (iron, ferritin, zinc, B vitamins) may be useful if your nails are chronically brittle and external care is not sufficient.
Flawless nails without damaging your own.
Popnails press-on nails apply in 10 minutes, with no buffing, no UV, no acetone. The natural nail remains intact.
