What could cause my toe nail to turn black?

Answer by  DebH2010 (291)

A black toenail often results from the toe striking the end of the shoe. It doesn't have to be a painful injury for enough pressure to occur to cause the bruising. It could also happen due to a fungal infection.

Answer by  Zach29 (153)

A toenail can be injured from running or walking (as the nail hits the shoe repeatedly). This can cause it to turn black.

Answer by  notadoctor (19)

The most common cause would be poor circulation in the foot and not enough blood is getting to the toe.

Answer by  champaign9497 (11977)

If your toenail has turned black it could be a number of things causing it there are different treatments for all of them but the best advice see your Doctor.