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    Question ID:   6010         Current Version: 1
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  

 
    Answer:
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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