Why Do Nails Get Ridges? Why It Really Happens

Nail ridges are very common, and they usually mean nothing serious. Vertical ridges that run from your cuticle to the tip of your nail are almost always a normal part of aging. Horizontal ridges, sometimes called Beau’s lines, are different and can signal a past illness or injury. Understanding which type you have is the first step to knowing if you need to do anything about it.

What Causes Vertical Ridges in Nails?

Vertical ridges, or onychorrhexis, are the most common type. Research shows they are primarily caused by aging. As you get older, your nail matrix — the tissue under your cuticle that produces the nail plate — slows down. The cells become less uniform, and this creates small grooves on the surface.

Some studies suggest dehydration can make vertical ridges more noticeable. Your nail plate is about 18% water by weight. When it loses moisture, the ridges can look deeper and more pronounced. This is why some people notice ridges more in winter or after washing hands frequently.

Vitamin deficiencies are often blamed for vertical ridges, but the evidence here is weak. Some people report improvements after taking biotin or iron, but strong clinical trials do not confirm that low levels of these nutrients cause ridges in most people. Unless you have other symptoms of a deficiency, vertical ridges are likely just age or dryness.

What Do Horizontal Ridges (Beau’s Lines) Mean?

Horizontal ridges that go across the nail are called Beau’s lines. These are not normal aging. They form when the nail matrix temporarily stops growing due to a physical stressor. The groove appears weeks after the event because nails grow slowly — about 3 millimeters per month on fingers.

Common causes include high fever, major illness, chemotherapy, or a serious injury to the nail itself. Beau’s lines can also appear after a traumatic life event like surgery or childbirth. The depth of the line usually correlates with the severity of the stressor. A deeper line suggests a more significant interruption in growth.

As of 2026, current research suggests that multiple Beau’s lines on different nails may indicate a systemic issue. If you see them on several nails at once, and you have not had a recent illness, it is worth mentioning to your doctor. One isolated Beau’s line on a single nail is often just from local trauma, like slamming your finger in a door.

Can Nail Ridges Signal a Health Problem?

Most ridges are harmless, but some patterns deserve attention. The key is looking at the whole picture, not just the ridges themselves. If your nails are also brittle, discolored, or lifting away from the nail bed, that changes the story.

Some research has linked severe vertical ridging with conditions like thyroid disease, anemia, or autoimmune disorders like lupus. But these connections are associations, not causes. The vast majority of people with vertical ridges do not have any underlying disease. Doctors typically look for other nail changes — like thinning, splitting, or color changes — before investigating further.

Horizontal ridges are a stronger signal. Because they mark a pause in nail growth, they can help doctors timeline a past illness. For example, if a Beau’s line is halfway down your nail, your doctor can estimate you were sick about two months ago. This can be useful if you had a mild infection you did not realize was significant.

One non-obvious clarification: spoon nails, which curve upward, are more strongly linked to iron deficiency than ridges are. If you are worried about your health, look at the shape and color of your nails, not just the texture.

What Actually Helps Reduce Nail Ridges?

If you want to improve the appearance of ridges, the evidence points to hydration and gentle care. There is no proven way to reverse the aging process in your nail matrix, but you can make existing ridges less visible.

Keeping nails moisturized is the simplest step with the most support. Applying a nail oil or thick hand cream daily can plump up the nail plate and make ridges look shallower. Look for ingredients like jojoba oil, vitamin E, or lanolin. These penetrate the nail better than basic lotions.

Biotin supplements are widely promoted for nail health, and some evidence supports them. A 2018 review in the journal Skin Appendage Disorders found that biotin improved nail thickness and reduced splitting in people with brittle nails. But the studies were small, and the effect on ridges specifically was not well measured. If you try biotin, give it at least 3-6 months because nails grow slowly.

Gentle filing can help cosmetically. Use a fine-grit nail file and only file in one direction. Sawing back and forth weakens the nail and can make ridges worse by causing peeling. A ridge filler base coat can also smooth the surface temporarily without any side effects.

What Should You Avoid for Nail Ridges?

Several popular remedies have little evidence behind them and can actually harm your nails. Gel manicures and acrylic overlays are a common example. While they temporarily hide ridges, the removal process often involves soaking in acetone and scraping the nail surface. This thins the nail plate over time, making ridges more noticeable when the overlay comes off.

Avoid aggressive buffing. Some people use a buffer block to sand down ridges. This removes layers of the nail plate permanently. Your nail cannot regrow those layers thicker. Repeated buffing leads to thin, weak nails that split easily. If you want a smooth surface, use a ridge filler polish instead of a buffer.

Cuticle removal is another practice to skip. The cuticle protects the nail matrix from bacteria and injury. Pushing it back or cutting it off can damage the growth area and potentially cause new ridges or infections. Keep cuticles intact and just push them gently after a shower when they are soft.

Some online sources claim that soaking nails in lemon juice or apple cider vinegar removes ridges. This is not supported by any evidence. These acids can dry out the nail and surrounding skin, making ridges look worse. Stick to gentle moisturizing methods.

Common Misconceptions About Nail Ridges

The most persistent myth is that ridges always mean you are missing a vitamin or mineral. This idea is repeated endlessly on social media and wellness blogs. The reality is that most people with ridges have normal nutrient levels. If you eat a balanced diet, your ridges are almost certainly not a deficiency sign.

Another misconception is that ridges can be permanently cured. Because ridges are often caused by the natural aging of the nail matrix, there is no cure. You can improve their appearance, but you cannot make them go away forever. Accepting this can save you money on expensive treatments that overpromise.

Some people also believe that ridges on toenails are more serious than ridges on fingernails. This is not true. Toenails often develop ridges from pressure inside shoes or from minor repeated trauma. The same rules apply — vertical ridges are normal aging, and horizontal ridges signal a past stressor.

A less common but important clarification: ridges that appear suddenly on all twenty nails at once are unusual. If you wake up one day and every nail has a new ridge, that warrants a medical check. But gradual changes over years are normal and expected.