Life-saving warnings your nails are sending

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Large Ridge or Crack in the Center of the Nail

Median Nail Dystrophy causes a large crack like this one, and is usually the result of you picking at the nail fold.

Severe Nail Splitting and Thinning

Severe nail splitting like this can be caused by Lichen Planus, which is hard to diagnose, but can be an itchy and painful skin condition.