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First, a crash course on what fingernail ridges even are: Vertical nail ridges (lines that run from your cuticle to the tip of your fingernail) are super-common, and are a normal sign of aging ...
What are ridges in fingernails? “Ridges in the fingernails are vertical or horizontal depressions on the nail plate,” says Angela Kim, D.O., a board-certified dermatologist practicing in Yuba ...
"Brittle nails can split at the distal part of the nail (or away from the center), and due to aging and consistent hand washing, brittle nails can also have what is called longitudinal ridges ...
"The longitudinal striations can occur as a normal part of the aging process", [2] and not until the nails start to thin and get a sandpaper look is the condition called trachonychia. The nails are opalescent and frequently are brittle and split at the free margin. There has been evidence of the condition as a cutaneous manifestation of lichen ...
While Beau's lines are actual ridges and indentations in the nail plate, Muehrcke lines are areas of hypopigmentation without palpable ridges; they affect the underlying nail bed, and not the nail itself. Beau's lines should also be distinguished from Mees' lines of the fingernails, which are areas of discoloration in the nail plate.
Manicures, nail polish and remover, nail biting, and repeated trauma such as typing, can contribute to nail splitting. [1] Dehydration likely plays a role. [3] Nutritional deficiencies that can result in nail splitting include iron, selenium, and zinc. [1] Some skin diseases such as psoriasis and lichen planus may feature such nails. [3]
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Polyonychia can also be acquired, such as after an accident that affected the nail bed causing it to split. This type of polyonychia is just referred to as "post-traumatic split nail" [3] Polyonychia's syndromic causes include: Isolated congenital onychodysplasia [4] Polyonychia's non-syndromic causes include: