Question: |
How fast does our hair grow? |
Category: |
Health & Beauty > Hair |
Keywords: |
fast, hair, growth, rate, grow |
Type: |
other |
Rating: (0 ratings) Views: 738 Discussions: 0 In Watch Lists: 1 |
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Answer:
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Hair growth varies depending on body region. For example, average eyelash/brow growth rates have been reported at 0.16 millimeters (mm) per day, scalp hair at 0.34 to 0.36 mm/day, and beard hair at 0.38 mm/day. Growth rates also are affected by age, gender, hair color, and ethnicity. For example, scalp hair in a prepubescent, adolescent, adult, and older adult have been reported at 0.41, 0.30, 0.34, and 0.32 mm/day, respectively [1].
Interindividual variability also occurs. Scalp hair grows at an average rate of 1 centimeter (cm) per month, but can range from 0.6 to 3.36 cm/month [2]. Thus, 12 cm can represent 3½ to 20 months of hair growth.
Sources:
[1] Myers RJ, Hamilton. 1951. Regeneration and rate of growth of hairs in man. Ann NY Acad Sci. 1951; 27(53):562-8.
[2] Harkey MR. 1993. Anatomy and physiology of hair. Forensic Sci Int. 1993 Dec; 63(1-3):9-18.
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