Vertical grooves – which run from the root to the tip of the nail – are the most common . The good news is that they are often completely normal, especially with age . Like wrinkles in the skin, they develop as cell turnover slows down. So it is more a question of maturity than pathology.
However, if these edges become more pronounced, if the nails become brittle, or if they change color, this could indicate a mild deficiency (of iron, zinc, or vitamin B) or dehydration of the nail . Nothing serious, but it may need a little nutritional boost .
