Dryness can make these lines more noticeable. Frequent handwashing, detergents, cold weather, and loss of natural moisture may also make nails more brittle and ridged.
Sometimes ridges can be associated with nutritional deficiencies or health conditions, especially if they appear with fatigue, hair thinning, skin changes, splitting, or other unusual nail changes.
Moisturizing your hands and nails, staying hydrated, eating a balanced diet, and avoiding harsh nail treatments may help. See a healthcare professional if you notice sudden dark streaks, pain, swelling, major discoloration, or rapid changes in one nail.
