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1.Genetic 

Genetics makeup plays a big role in when (or if) you develop white hair. If you notice white hair at an early age, it’s likely that your parents or grandparents also had graying or white hair at an early age.

2. Nutritional Deficiency

White hair at an early age can also indicate a vitamin B-12 deficiency. This vitamin plays an important role in your body. It gives you energy, plus it contributes to healthy hair growth and hair color.

A vitamin B-12 deficiency is associated with a condition called pernicious anemia, which is when your body can’t absorb enough of this vitamin. Your body needs vitamin B-12 for healthy red blood cells, which carry oxygen to cells in your body, including hair cells. A deficiency can weaken hair cells and affect melanin production.

3. Health Conditions

Hormonal changes caused by a thyroid problem such as hyperthyroidism or hypothyroidism may also be responsible for premature white hair. The thyroid helps control many bodily functions such as metabolism. The health of your thyroid can also influence the color of your hair. An overactive or underactive thyroid can cause your body to produce less melanin.

An autoimmune disease can also cause premature gray hair. This is when the body’s immune system attacks its own cells. In the case of alopecia and vitiligo, the immune system can attack hair and cause loss of pigment.

4. Smoking

There is a connection between premature gray hair and smoking. One studyTrusted Source of 107 subjects found a connection between the “onset of gray hair before the age of 30 and cigarette smoking.”

It’s well-known that smoking cigarettes increases the risk for lung cancer and heart disease. The long-term effects, however, can go beyond the heart and lungs and affect hair. Smoking constricts blood vessels, which can reduce blood flow to hair follicles and cause hair loss. Additionally, toxins in cigarettes can damage parts of your body including your hair follicles, causing early gray hair.

5. Stress

Stress can also affect your hair. A 2013 studyTrusted Source found a connection between stress and a depletion of stem cells in the hair follicles of mice. So if you’ve noticed a rise in your number of white strands, stress might be the culprit.

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