Seven years ago, when I first entered the world of marathons, I joined a group of runners who, on our very first long run, let me know the chaos that training for 26.2 miles would bring. Being the ...

If you're a runner, you know that black toenails are common—but that doesn't mean you have to put up with them. Beth Skwarecki is Lifehacker’s Senior Health Editor and has been writing about health, ...

A few weeks before her first marathon, Kristel Crame bought a trendy purple polish to cover her toenails, one of which she'd bruised on a long training run. But as she started her at-home pedicure, "I ...

When Maria Delgado noticed a dark streak under her big toenail, she assumed it was from dropping her gym bag on her foot. Six months later, that seemingly innocent mark led to a diagnosis that saved ...

Seven years ago, when I first entered the world of marathons, I joined a group of runners who, on our very first long run, let me know the chaos that training for 26.2 miles would bring. Being the ...

Wriggling toes in the sand and wearing sandals are warm weather treats, unless you’d rather keep your toes under wraps due to thickened, yellowish nails. Nail fungal infections (known as onychomycosis ...

Thick yellow toenails are usually caused by a fungal infection called onychomycosis. This can be irritating or painful. It’s less common, but the infection can affect your fingernails as well. Thick ...