What Can Cause A Black Toenail?

Diabetes

There are a few underlying medical conditions that can cause a black toenail to form, one of which is diabetes. Diabetes occurs when the body doesn't have enough insulin to process sugar. The levels of glucose in the blood build up because the insulin isn't moving the glucose from the blood to the cells, which use glucose as energy. With type 2 diabetes, cells in the body don't respond well to insulin. When the disease reaches later stages, patients might not create enough insulin. In type 1 diabetes, the body isn't able to create insulin of its own. Diabetes can cause many symptoms. It's common for there to be issues with circulation. Diabetic neuropathy in the feet occurs often.

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