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一个正常成年人头发约有10万根,每天有近100根会自然脱落。那为什么正常人并没有在3年左右的时间内变成秃头呢?常言道,旧的不去新的不来,头发的“一生”要经历生长期、退行期和休止期3个阶段。这三个阶段的头发同时存在于人的头顶,确保了头发数量处于动态的平衡状态。生长期是头发的“青壮年”时代,平均每月能长1.25厘米,这一阶段持续时间可达2~7年,比另外两个阶段长得多。对于一个头发健康的人来说,85%的头发都处于生长期。
A normal adult hair about 100,000, nearly 100 a day will naturally fall off. Why then normal people did not become bald in about 3 years time? As the saying goes, the old do not go to new, hair, “life” to go through the growth phase, the regression period and the rest period of three stages . These three stages of hair exist in the human head at the same time, to ensure that the number of hair in a dynamic equilibrium. Growth period is the hair “young ” era, the average monthly length of 1.25 cm, this period lasts up to 2 to 7 years, much longer than the other two stages. For a healthy person, 85% of the hair is in the growing season.