"Qiupu Song" has a sentence: White hair is three thousand feet, despair is a long. The great poet vividly gave an exaggerated description of the gray-haired disease caused by his inner sorrow. With the rapid increase in social pressure, the number of people who are "sorrow-like" is increasing, and the number of middle-aged and young white-haired people watching people on the street is increasing. So how is gray hair produced?

　　How come there are few white heads?

　　Juvenile gray hair refers to genetic factors or certain diseases Early-onset white hair disease, commonly known as less white head. The white hair that suddenly occurred in youth is abnormal, and its appearance is equivalent to sounding the alarm of the health of the body. However, due to genetic factors since childhood, there are fewer white heads, except for the increase in gray hair, and physical health is not affected.

　　Modern medicine believes that white hair disease is mainly due to the decrease in the formation of melanin in the hair, the weakening of the melanin-forming function of melanocytes, and the decrease in the activity of tyrosinase.

　　 And Chinese medicine believes that the generation of white hair is related to the kidney, liver, and spleen: the kidney hides the essence, which is in the hair, which means that the quality of the hair reflects the kidney qi, kidney essence and the foot Insufficient performance; the liver hides blood, and the hair is more than blood. The growth of hair is derived from the nourishment and maintenance of qi and blood. If the qi and blood cannot go to the head, it can cause the hair to turn white, just like the crops in the crop field. When the moisture is nourished, it will be the same. So, what are the main factors for white hair?

　　 First, lack of qi and blood, insufficient kidney essence: deficiency of qi and blood, which leads to the loss of hair and nourishment of hair, so "white flowers" are born on the head. .

　　Secondly, the blood heat is prosperous: on the one hand, due to the prosperity of the young people’s body yang, the fiery evil is easy to consume the yin and blood, causing blood deficiency and dryness, and the hair is deficient, and the hair is white. On the one hand, if you get angry and the liver is vigorous, you will have bloody heat and dryness, and the hair roots will become malnourished.

　　The third is liver depression and spleen dampness. When people are "depressed", liver qi will stagnate, damaging the heart and spleen, so angry people often eat unscented or unwilling to eat, which causes qi and blood biochemistry Passive, so gray hair. It is not unreasonable to say, "Laugh a little for ten years, and sorrow for a while."