Many possibities : It could mean a vitamin defiency, an auto immune disease and others. Is there any discoloration ?
Answered 7/20/2018
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Usually a sign of: An injury, often a minor injury that you may not even recall. Transverse lines usally are similar to rings on a tree--you can identify approximately about when the injury occurred by how much the nail has grown.
Answered 9/21/2017
5.1k views
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