Add Yahoo as a preferred source to see more of our stories on Google. "The most common issue is nail fungus (onychomycosis)," says Dr. McEneaney. "This is typically the same fungus that causes athlete ...

"The most common issue is nail fungus (onychomycosis)," says Dr. McEneaney. "This is typically the same fungus that causes athlete's foot. It's very transmittable and very easy to pick up walking ...