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 ...

Treatment for thick toenails typically includes treating the underlying cause, which can include things like mechanical stress (such as poorly fitting shoes), fungal infection, or an autoimmune ...

Toenail discoloration is a common issue. Possible causes of discolored toenails range from minor toe injuries and fungal infections to more severe health conditions, such as melanoma. Toenails are ...

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 holds certifications as a ...

You may experience pain, discomfort, and infection with a curled toenail. Ingrown toenails are common and often affect your big toe. Emergency care may be needed if you notice red streaks on your ...