Why is half of the hair white?

Nowadays, people are under great pressure at work, which easily leads to various problems. Many young people will experience gray hair, and the causes of this problem are rather complicated. Some of them are due to irregular lifestyle, which affects their health. If the body secretes less melanin, the color of the hair will naturally change. Gray hair can easily cause other diseases, so we should pay attention to it. Why is half of my hair white?

1. Causes of premature graying of hair

What determines hair color is the amount of pigment particles in the hair, which is related to the development and growth of pigment cells in the hair root papilla. When hair turns from black to white, it is generally due to the decline of the function of the hair pigment cells. When they decline to the point where they can no longer produce pigment particles, the hair turns completely white. In normal people, hair pigment cells begin to decline from the age of 35. Some people have white hair in their 20s, which is medically called juvenile graying, commonly known as "premature graying".

2. Acquired causes of gray hair

The causes of premature graying of hair are rather complex, and are related to both genetic and physical factors as well as various acquired factors.

Acquired premature graying of hair. There are many causes: malnutrition, such as lack of protein, vitamins and certain trace elements (such as copper), can cause hair to turn white; certain chronic wasting diseases such as tuberculosis, due to nutritional deficiencies, the hair will turn white earlier than ordinary people; some patients with long-term fever will have yellow and brittle hair or even turn white and fall out; some endocrine diseases, such as pituitary or thyroid diseases, can affect the ability of pigment cells to produce pigment granules and cause hair to turn gray prematurely.

3. Premature graying of hair caused by disease

Encephalitis, nervous system diseases, etc. can also cause hair to turn white; the skin, hair and eyebrows of patients with albinism are all white; the disease that causes skin whitening - "vitiligo", if it occurs on the scalp, the hair will also turn white; some people believe that the more you use your brain, the earlier your hair will turn white; some young people have a lot of white hair in a short period of time, which is related to serious mental trauma such as excessive anxiety, sadness, or mental fatigue.