What Causes Nail Fungus. Toenail fungus can be caused by several different types of fungi. Fungi are microscopic organisms related to mold and mildew.
It s inevitable but as we age our bodies begin to break down and our immune systems to weaken. An infected nail may separate from the nail bed. Toenail fungus that s left untreated can spread throughout your feet and other parts of your body.
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Toenail fungus that s left untreated can spread throughout your feet and other parts of your body. Usually nail fungus happens when fungus gets in your nail through a small trauma cut or break to the nail. A fungal nail infection occurs from the overgrowth of fungi in under or on the nail. Tiny microscopic organisms called fungi the plural of fungus cause a fungal nail infection.