For many years my fingernails grow slightly curled downward. I have read that it is a sign of different medical issues. I googled the term diabetes and fingernail problems and found this article. I don't believe everything I see on the internet so it's a maybe/maybe not for me.
Fingernails: how to recognize diabetes in nails?
Typical diabetes nail features are: (1) Opaque white nails with a dark band at the fingertip, (2) Yellowing of the nail bed, (3) Terry's nail, (4) onychomoycosis, (5) blue lunula, (6) redness in the proximal nail fold (paronychia), and a (7) flat- or spoon nails. Nail diseases are in a separate category from diseases of the skin. Although nails are a skin appendage, they have their own signs and symptoms which may relate to other medical conditions. Nail conditions that show signs of infection or inflammation require medical assistance and cannot be treated at a beauty parlor. Deformity or disease of the nails (diabetes nails) may be referred to as onychosis.
The most common (finger)nail diseases:
The most common nail disease are: Onychocryptosis (= ingrown fingernails), Onychodystrophy (nail deformation), Onychogryposis (ram's-horn nail), Onycholysis (loosening of the nail bed), Onychomadesis (falling off), Onychomycosis (contagious infection), and Koilonychia (nail curves upwards) - source: Wikipedia.
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