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 ...

Sarah Jividen, RN, BSN, is a trained neuro/trauma, and emergency room nurse turned healthcare writer. As a journalism major, she combined her love for writing with her passion for high-level patient ...

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 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 ...

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 ...

For many, running is a passion, an escape, and a fantastic way to stay fit. However, for some, it comes with an unwelcome guest: the black toenail. While not usually serious, it can be painful and ...