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Hair loss and hair growth in numbers

Hair Loss

50-100 - The number of hair that fall naturally every day. When this number is exceeded, it is consider as abnormal hair loss.

8 to 10 days - The number of days hair is at rest (catagen phase).

2-3 months - The number of months before hair fall out after the death of the cell (telogen phase).

2 to 3 weeks - the number of weeks before the beginning of hair loss during certain chemotherapies.

Hair growth

0.3 mm to 0.5 mm - Daily hair growth, which means that there is a growth of approximately 1 cm to 1.5 cm per month or 12 cm to 18 cm per year. The main element that determines the growth of the hair is the hair type, but some hair problems can slow the growth. All the hair together can grow from 30 to 85 meters per day, or 0.9 km to 2.55 km per month.

25 to 30 - The number of hair  that may grow into each hair follicle in total for all lifetime.

10 m - Maximum growth that a hair can reach in a human life. (1000 km to 1700 km if the hair were placed end to end)

3 - The number of phases of the hair life cycle (anagen, catagen, telogen).

2-5 years - hair life according to the different phases of growth.
48 months - The number of months during which the hair is growing (anagen phase of the hair life cycle).

5.627 meters - the length in meters of the longest hair according to Guinness World Records. This record is held by Xie Qiuping from China since 2004. Her hair growth started in 1973 at the age of 13. If Xie Qiuping hair growth remained similar since 2004, about 18 cm per year, they would be about 7.24 meters in 2013.

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