Fungus: Athletes foot and thick yellow brittle toenails are caused by fungus. The foot is in a shoe which is a dark moist enviroment that fungus tends to thrive especally if their is a lot of perspiration.
Answered 7/18/2012
5.7k views
Athlete's foot is: A fungal infection of the skin. Thickened nails are often fungal, but it can also happen from an injury or repeated microtrauma to the nails.
Answered 9/11/2017
5.7k views
6 doctors weighed in across 2 answers
6 doctors weighed in across 2 answers
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