Ridges on your nails can be harmless or signal a deeper issue, according to Dr. Ross Perry, a skin expert at Cosmedics. “Nutritional factors like a lack of Vitamin A, or if your body is low on protein or calcium, may lead to ridges forming,” he explains. Severe iron deficiency may also cause noticeable changes.

Still, most nail ridges aren’t serious. “Common issues include nails that are brittle, loose, or change color or shape,” the NHS notes. Habits like picking at nails can also create ridges.

However, Dr. Perry warns that “severe, deep ridges” could point to more serious problems like kidney disease or diabetes, and should prompt a doctor visit.

Seek medical advice if your nails become discolored, fall off without cause, or if surrounding skin is sore, swollen, or warm—signs of possible infection (paronychia).

The NHS also recommends seeing a podiatrist if your nails are too tough to cut or hard to reach. While nail changes are often minor, it’s smart to stay alert and consult your GP if something seems off.