Toenails can turn black from nutritional deficiencies, infection, or trauma. This may go away on its own. If not, see your doctor to rule out a more serious cause. Read on to learn about the ...

But usually, if you’ve upped the mileage and your toes start turning black, the cause is the obvious one. While bruised ...

"The most common reason for nails that are completely black is trauma,” says Canuso. Simply stubbing your toe can cause a bruise to form under the toenail, which in turn can turn your nail black.

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 ...

This bruising causes the toenail to turn black over time.” “Athletes, particularly runners, may develop black toenails due to repetitive stress on the toes. Continuous pressure and friction ...

Fungal infections—like athlete’s foot—can spread to your toenails and turn them shades of yellow, blue, green, brown, purple, and black, Sutera explains. This range in color is unique to ...

One thing you probably weren’t thinking of? Toenails that turn black and, in some cases, even fall off. Um, what? Sorry to be the bearer of bad news, but if you run on the regular, you can ...

Oct. 31, 2008— -- "My toenails turning black happened before," said Jessica Horne, 26, an amateur athlete who will be running for the second time in the ING New York City Marathon this Sunday.

Throughout my years of running I have suffered not only from blisters,but I also experienced some of my toenails turning black and then some of them eventually falling off. New toenails would ...

Their nails also may have ridges or indentations in them and can also turn black or green. One of the most common causes of yellow toenails in an infection by a fungus that attacks the nails.