What could be the cause of my toenails being blue?

Answer by  Amy21 (460)

Your toenail could be blue for the reason that maybe you bruised it. This would cause it to turn blue.

Answer by  Amanda94 (40)

Lack of blood flow would be the most likly cause of blue toenails. My best guess would be that you've got either a clotted or blocked artery or a your are too cold (toe nails turn blue first) in which case you've got an oxygen problem.