A member asked:

What causes athletes foot and thickecking toenails?

6 doctors weighed in across 2 answers

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

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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

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