Most nail ridges are harmless and manageable at home with a combination of moisturizing, gentle buffing, and nutritional support. The first step is figuring out which type you have, because vertical ridges (running from cuticle to tip) and horizontal ridges (running side to side) have very different causes and solutions.
Vertical vs. Horizontal Ridges
Vertical ridges run lengthwise from your cuticle to the tip of your nail. They’re extremely common and, in most cases, are simply a sign of aging. As you get older, your nail matrix (the tissue under your cuticle that produces the nail plate) gradually loses its ability to create a perfectly smooth surface. Dry skin, eczema, thyroid problems, and iron deficiency can also cause or worsen vertical ridges.
Horizontal ridges are a different story. These dents, called Beau’s lines, form when something temporarily interrupts nail growth. Your body essentially pauses nail production to redirect energy elsewhere. Common triggers include high fevers, severe illness (including COVID-19, pneumonia, and measles), major physical stress, chemotherapy, and nail injuries like slamming a finger in a door. Zinc deficiency and long-term use of acrylic or gel nails can also cause them. Horizontal ridges typically grow out on their own once the underlying cause resolves, since fingernails grow about 3 to 4 millimeters per month.
Nutrient Gaps That Show Up in Your Nails
Several nutritional deficiencies can directly affect nail texture. Iron deficiency is one of the most common culprits, causing brittle nails with vertical ridges and, in more severe cases, a spoon-shaped dip in the nail plate. Zinc deficiency produces horizontal grooves (Beau’s lines) along with white spots and brittleness. Calcium deficiency has been linked to longitudinal ridges and easy breakage. Protein deficiency and general malnutrition can slow nail growth and create horizontal dents.
If your ridges appeared relatively suddenly or are getting worse, it’s worth looking at your diet. Iron-rich foods include red meat, lentils, spinach, and fortified cereals. Good sources of zinc include oysters, beef, pumpkin seeds, and chickpeas. A blood test can confirm whether you’re actually deficient before you start supplementing, since too much of certain minerals (like iron) can cause its own problems.
How to Smooth Ridges at Home
For vertical ridges caused by aging or dryness, a few consistent habits can make a noticeable difference.
Moisturize your nails and cuticles daily. Nails are made of keratin, and like your skin, they lose moisture and become rougher when they’re dry. Look for creams or ointments containing urea at a concentration between 5% and 20%. Urea hydrates the nail plate and gently softens rough texture. Concentrations above 20% can actually over-soften and weaken nails, so more is not better here. Lactic acid (an alpha hydroxy acid) at 5% to 10% is another ingredient that helps smooth the nail surface. Even plain petroleum jelly or a thick hand cream applied to your nails and cuticles before bed works well as a baseline.
Buff gently and infrequently. A fine-grit nail buffer can physically smooth out mild vertical ridges, but limit this to once a month at most. Overbuffing thins the nail plate, making your nails weaker and more prone to peeling and breakage. Use the smoothing side of a buffer block (not the coarse shaping side), and apply light pressure. You’re polishing, not sanding.
Use a ridge-filling base coat. If the ridges bother you cosmetically, ridge-filling base coats contain fine particles that settle into the grooves and create a smoother surface for polish. This doesn’t treat the ridges, but it’s a safe, immediate cosmetic fix.
Protect your nails from damage. Wear gloves when washing dishes or using cleaning products. Harsh chemicals and prolonged water exposure strip oils from your nails and make ridges more prominent. Avoid picking or pushing at your cuticles, which can damage the nail matrix and create grooves, particularly on the thumbnails.
What to Do About Horizontal Ridges
Horizontal ridges usually don’t require direct treatment because they reflect something that already happened. If you had a bad flu three months ago, you may notice a dent forming partway up your nail now. That dent will gradually grow out over the next several months as new, smooth nail replaces it. Fingernails take roughly six months to fully regrow; toenails can take 12 to 18 months.
If you’re getting horizontal ridges on multiple nails at the same time without an obvious cause like a recent illness, that’s worth investigating. It could signal a circulatory issue, a nutritional deficiency, or an ongoing health problem that’s repeatedly interrupting nail growth. A single nail with a horizontal dent after an injury is nothing to worry about.
If gel or acrylic nails are the cause, giving your natural nails a break for several months allows new, undamaged nail to grow in. During that time, keep nails short and moisturized to reduce breakage.
When Ridges Signal Something Else
Nail ridges on their own are rarely dangerous, but certain changes alongside ridges deserve attention from a dermatologist. The American Academy of Dermatology identifies several nail changes worth having examined:
- Small pits that look like icepick marks can indicate psoriasis, eczema, or alopecia areata.
- A new or changing dark streak under the nail could be melanoma and should be checked promptly.
- Nails that curve downward (clubbing) may signal lung, heart, or liver disease.
- Spoon-shaped nails that dip in the center suggest iron deficiency anemia.
- Yellow, thickened nails that stop growing can point to lung disease, rheumatoid arthritis, or a serious nail infection.
- Color changes like blue nails (low oxygen), white nails (liver disease or diabetes), or half-pink, half-white nails (kidney disease) are all worth investigating.
Vertical ridges without any of these accompanying signs are almost always benign. If your ridges are paired with nails that are crumbling, thickening, changing color, or separating from the nail bed, or if you also have symptoms like fatigue, hair loss, or unexplained weight changes, a doctor can run bloodwork to check for thyroid problems, iron deficiency, or other underlying conditions. Treating the root cause typically improves the nails over time as new growth comes in.