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How does alopecia occur?

On the average scalp, there are about 100,000 hairs. Hair grows about one centimeter a month and lasts on the scalp for 3 to 5 years. It's normal to lose around 100 hairs from the scalp each day. If healthy new hairs continue to grow in place of those lost, no change in thickness is seen. Thinning and hair loss occurs when hair falls out rapidly, becomes damaged or doesn't grow back.

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Author: Lauren Donley BSc (Hons)
First answered: 18 Sep 2014
Last reviewed: 19 May 2018
Rating: 4.7 out of 5
Votes: 566 (Click smiley face below to rate)
Category: Male pattern baldness


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