Most nail disorders are characterized as fungal infections, also called onychomycosis or tinea unguium, and both toenails and fingernails are vulnerable. About 1 in 10 Americans are affected, and you’re at a higher risk of developing these infections the older you are. Symptoms can vary, but typically include nail pain or soreness, thickened nails, a distorted appearance, nail darkening, yellowish streaks, separation of nail from nail bed, brittleness, or even foul smells.
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