Premature graying of hair is also known as canities. Going gray isn't always related to aging. If you're not yet 40 and see more than a few gray hairs, chances are it runs in your family. Premature graying of hair has been observed with greater frequency among certain families, suggesting a family predisposition for this condition. Gray usually isn't a sign of poor health, though anemia, thyroid issues, vitamin B12 deficiency, and vitiligo can cause premature graying. You can highlight or colour hair to cover the gray, but beware: some people are sensitive to the chemicals in dyes. The result could be an itchy, burning scalp.
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