Is white hair white as soon as it grows, or does it turn white from black hair?

It's all possible, and some of them change from black hair to white hair. There are also some white hairs that began to appear in childhood.

white hair refers to all or part of white hair. White hair is caused by the decrease of melanin particles in the medulla and cortex of hair or by air filling. There are two reasons: congenital and acquired.

Under normal circumstances, there are abundant blood vessels in the dermal papilla, which provide sufficient nutrition for the dermal papilla and hair bulb, and melanin particles can be synthesized smoothly. When the formation of melanin particles in the hair papilla and hair bulb is hindered, or the melanin particles in the medulla and cortex of hair can not be transported to the hair due to some factors, white hair will appear.

Extended information:

White hair refers to the total or partial whitening of hair, which can be divided into congenital and acquired types. Congenital white hair often has a family history, especially local white hair, which is more common in the hairline in front of the head. Acquired white hair includes senile white hair and juvenile white hair. Some are old and weak with little white hair.

Adolescent gray hair mostly occurs in children and adolescents, and often has a family history. Except for the increase of gray hair, it does not affect the health. The sudden occurrence of white hair in youth is related to nutritional disorders. Generally speaking, there are several reasons in the day after tomorrow: lack of nutrition, long-term mental stress and lack of sunshine.

Chinese medicine believes that gray hair is caused by kidney yin deficiency, and weak renal function slows down the body's metabolic function. Therefore, the treatment of gray hair should first supplement kidney yin and fundamentally adjust the treatment. In addition, some skin diseases such as vitiligo can also cause white hair.

Normal people usually start to have gray hair at the age of 35. If they appear early, they'd better go for treatment. The white hair caused by congenital inheritance is difficult to treat, but the white hair caused by acquired causes can be improved after treatment.

Baidu encyclopedia-white hair