It’s often said that the eyes are the window to the soul. But might fingernails reveal your health status? All kinds of conditions and diseases can affect your nails. For example, small depressions or pitting often occur in people with psoriasis.
A 2012 paper noted that 77 percent of psoriasis sufferers have nail abnormalities, most commonly pitting and onycholysis (a separation of the nail from the nail bed). Though far more common on toenails, fungus can also infect fingernails (onychomycosis), causing nails to thicken and turn yellowish.