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 ...

Black toenails are usually the result of toenail injury. However, there are other things that can cause a black toenail, including fungal or bacterial infections. Most cases of black toenails aren’t ...

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 ...

Black toenails can result from an injury, a fungal infection, or pigmentation changes over time. More serious causes include heart disease or melanoma. Treatment for black toenails will vary depending ...

Your nails can say a lot about your health: Discoloration, brittleness, and breakage are annoying to deal with on your fingers, but they’re also signs you should watch out for on your toes. One ...

If you’ve been ramping up your running routine, you’re probably bracing yourself for a few of the unpleasant but common side effects of increasing your mileage—blisters, muscle tightness, and next-day ...