Fingernail ridges appear for multiple reasons, and dermatologists distinguish between two main types: vertical and horizontal ridges.
Vertical ridges run lengthwise down the nail and typically reflect normal aging. As we get older, nail cells grow at slightly different rates, creating these shallow lines. They're usually harmless and don't require treatment, though keeping nails moisturized can minimize their appearance.
Horizontal ridges, called Beau's lines, signal something more serious. These grooves run across the nail and indicate the nail stopped growing temporarily due to illness, injury, or stress. Severe infections, chemotherapy, high fevers, or psychological stress can trigger them. A nail injury or even aggressive manicuring can create similar patterns. Dermatologists note that horizontal ridges take weeks to months to grow out since fingernails grow about 3 millimeters per month.
Other causes include nutritional deficiencies, particularly in iron, zinc, or protein. Thyroid problems and certain medications can also produce ridged nails. In rare cases, ridges signal underlying conditions like psoriasis or lichen planus.
Treatment depends on the underlying cause. For vertical ridges due to aging, moisturizing the nails and cuticles with cuticle oil or hand cream helps. For horizontal ridges, addressing the root cause matters most. If an illness triggered them, the ridges typically disappear once you recover.
Dermatologists recommend these habits to maintain healthy nails. Keep nails hydrated by applying moisturizer after washing hands. Avoid harsh chemicals by wearing gloves during cleaning. Limit water exposure, as prolonged soaking weakens nails. Use a gentle file instead of metal tools. Skip gel manicures or space them at least six weeks apart to let nails recover.
If ridges persist, deepen, or accomp