I am just 20years old but my hair is turning grey
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In rare cases, premature graying may be triggered by health issues like thyroid disease or problems with the pituitary glands. Autoimmune diseases that attack the skin and hair, such as alopecia or vitiligo, can also cause grays. Autoimmune means your own cells are attacking your body, So if your body is attacking your hair cells, you can go gray as a result.
Your hair follicles have pigment cells that make melanin. Melanin is a chemical that gives your hair its color. As you age, these cells start to die. When there is a lack of pigment, new hair strands grow lighter and eventually turn to shades of gray, silver, and eventually white.