Striped or ridged nails—whether running vertically or horizontally—can hint at more than just cosmetic changes; they may reflect underlying health or nutritional issues. Vertical ridges (also called longitudinal lines) often develop with age and may also arise from deficiencies in vitamins like B, zinc, or iron, dehydration, or general wear and tear. Horizontal lines, known as Beau’s lines, cross the nail and signal that nail growth was interrupted—possibly due to illness, stress, nutrient shortfalls, or more serious medical conditions.

Vertical ridges tend to be less alarming and are common in many adults. But Beau’s lines warrant closer attention, especially if they appear suddenly, deeply, or on multiple nails. Possible causes include systemic diseases (e.g. diabetes, thyroid issues), severe infection, malnutrition, or trauma to the nail matrix.

To support healthier nails, maintaining a balanced diet rich in vitamins and minerals, staying well hydrated, and managing stress are helpful steps. But because striped or ridged nails can sometimes point to medical issues, it’s wise to consult a healthcare provider if you notice sudden, prominent, or worsening changes.