Generally speaking, juvenile white is divided into congenital and acquired. ? The white hair of some teenagers belongs to congenital white hair. Their hair is white when they are born, and this white color often accompanies them all their lives. If these Sao years are not anime characters such as Silver Soul Man, they may generally be albinos. ? Then the causes of natural gray hair are much more complicated, including mental gray hair, nutritional gray hair, disease gray hair, hereditary gray hair and so on. ? Psychogenic white hair? It refers to white hair caused by mental factors such as tension, anxiety, sadness and stress. For example, I didn't get into the exam to be good with my girlfriend and others, and my boss was forced to run away under the pressure of mortgage. There are different opinions about why mental stress makes hair turn white. Studies have shown that stress can cause melanocyte stem cells in hair to migrate to the skin. The greater the stress, the more melanocyte stem cells migrate, which leads to the whitening of hair and the increase of skin pigmentation. ? Of course, no matter what the reason, it is more common to induce juvenile white because of mental stress.