A black toenail can be alarming at first glance, especially when it appears suddenly without a clear reason.
While it may look serious, this condition is often caused by common and manageable factors.
Understanding why a toenail turns black can help you respond appropriately and maintain foot health.
One of the most frequent causes of a black toenail is trauma, such as dropping something heavy.
Athletes, especially runners, often experience this due to constant friction inside their footwear.
The black color usually comes from blood trapped under the nail, known as a subungual hematoma.
Fungal infections are another cause, which may lead to thickened, brittle, or misshapen nails.
Although rare, a black toenail may signal a more serious condition like skin cancer or melanoma.
If the discoloration does not move as the nail grows, you should consult a healthcare professional.
Ultimately, wearing properly fitted shoes and keeping feet dry can effectively prevent these issues.
