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Fungal Nail Infection (Onychomycosis) Overview. Fungal infection of the toenails or fingernails is caused by a fungal microbe that invades the nail bed. Fungal nail infection is also termed onychomycosis and tinea unguium. Fungal nail infection causes fingernails or toenails to thicken, discolor, disfigure, and split. At first, onychomycosis appears to be only a cosmetic concern. Without treatment, however, the toenails can become so thick that they press against the inside of the shoes, causing pressure, irritation, and pain.
In some cases, running a lot in brand new shoes that have not been worn in can cause a black toe nail fungus to appear. Walking a lot or running without socks can also give you a heightened chance of getting fungus underneath your toenails.