Fingernails can reveal important clues about your health. “Changes in nail texture and appearance can sometimes indicate underlying health issues.” One of the most common changes is the appearance of ridges, which may run vertically or horizontally.

Vertical ridges often appear with age and are usually harmless. They’re linked to slower cell turnover in the nail matrix. But if they come with discoloration or thickening, a medical check is wise. Horizontal ridges (Beau’s lines), however, can signal serious issues like high fever, surgery, or diseases such as diabetes. They suggest a disruption in nail growth and should be evaluated by a doctor.

Nutritional deficiencies—especially in iron, zinc, and B12—can also cause ridges. “Iron deficiency… is known to cause spoon-shaped nails (koilonychia)” and contribute to ridging. Genetics can play a role too, making some people more prone to nail changes.

Proper nail care, hydration, and a balanced diet are key to prevention. Social media “hacks” like nail buffers and oils may help, but overuse can harm nails. While many ridges are harmless, sudden changes, pain, or discoloration warrant medical advice.

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