Vertical Ridges on Fingernails After 40: Causes, Concerns & Care

Have you noticed thin vertical lines running from the base to the tip of your nails? These vertical ridges—also called longitudinal striations—are common after age 40. While usually harmless, they can sometimes signal underlying health concerns.

Why Do Vertical Nail Ridges Appear?

For most, these ridges are simply part of the natural aging process. As keratin production slows, nails lose smoothness—similar to how skin wrinkles or hair turns gray. Dehydration also plays a role, as aging nails become drier and more brittle, making ridges appear deeper.

Nutritional deficiencies in biotin, zinc, magnesium, or iron may also contribute. In rarer cases, conditions such as thyroid imbalance, poor circulation, or rheumatoid arthritis can be linked.

When to Worry

Seek medical advice if ridges are accompanied by:

• Dark streaks or discoloration

• Pain, swelling, or thickening

• Peeling or splitting nails

These could indicate fungal infections, trauma, or in rare cases, melanoma.

Nail Care Tips

To reduce ridges:

• Moisturize nails and cuticles daily

• Stay hydrated

• Eat a nutrient-rich diet with vitamins A, C, B-complex, zinc, and iron

• Use gentle nail tools and avoid harsh manicures

Healthy habits can keep your nails strong, smooth, and resilient as you age.