Nail ridges: Vertical ridges on the nails -- meaning they run from the cuticle to the tip of the nail -- are normal. They become more common with age. http://tinyurl.com/mje8xmn magnesium deficiency can sometimes be associated with soft or brittle nails, though. It's horizontal ridges (across the nail's width) that can be more indicative of various illnesses.
Answered 4/10/2020
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