What Causes Black Toenails. Black toenails are more common in runners who run long or at a high intensity than in those who are just getting started. A common culprit is repetitive trauma, caused by the motion of running and exacerbated by.
Nails that are completely black in color may have numerous causes, such as a b12 deficiency, kidney problems, or liver disease. But the most common reason for the discoloration is trauma, says canuso. Black toenail fungus is common among the athletes and generally among people who stand, walk or run a lot. If your black toenail happened due to an accident where your toe was.
Impact to the toenail causes bleeding underneath the nail's surface.
When in doubt, it is a good idea to be examined by a medical professional who can diagnose the problem and develop an effective. Black toenails are caused by trauma to the nail. Impact to the toenail causes bleeding underneath the nail's surface. Black toenails can also develop gradually from repeated injury, such as pressure from overly tight shoes or trauma to the toes caused by frequent running, hiking, or sports.
