What Those Vertical Ridges on Your Fingernails Might Be Telling You — Especially After 40

are typically harmless, there are times when they could signal something more serious. You should seek medical attention if your nail ridges are accompanied by:

• Dark brown or black streaks underneath the nail
• Nail splitting, thickening, or peeling
• Redness, pain, or swelling around the nail bed

These may point to a fungal infection, injury, or — in rare continue reading …