According to statistics, there are about 100,000 hair follicles on the head, with as many as 150,000 hair follicles. It’s normal to fall out anywhere from 50 to 100 strands of hair per day.
The density of hair follicles on the head of babies is 500-700/cm2, and the density of hair follicles on the head of adults is 250-350/cm2. The density of hair follicles in the elderly is slightly reduced.
About 10% of the hair is in the resting period. If the resting period is 2 to 3 months, it is normal for people to shed 50 to 100 hairs a day.
Don’t worry too much about hair fall out
The growth rate of each hair is 1.2 to 1.8 cm/month. The average life span of a hair is 2 to 7 years, and when it comes to rest, it can generally grow to about 1 m. A variety of factors affect the growth rate of hair. Hair grows faster in spring and summer than in autumn and winter; teenagers are more likely to grow hair than the elderly.
Hair follicles are each centered in an asynchronous cycle, and there are also 2 or 3 synchronous cycles of hair follicles. Under normal circumstances, this virtuous cycle can maintain the stability of the entire scalp and the normal hair loss every day, and prevent severe hair loss and excessive regeneration. If there is a problem with the hair follicle cycle, it can cause abnormal hair loss.
During the growth period, the daily hair growth rate varies slightly with age, gender and season. Different parts of humans have different hair growth cycles. Hair loss of 60-100 hairs per day is a normal physiological phenomenon.
For yellow and black people (brown and black hair), the average number of hairs is 100,000; for white people (brown hair), the average number of hairs is 120,000.