The Belgravia Centre Blog

The Basics of Hair Growth

Every hair is grown by a hair follicle, we have about 100,000 of them set deep into our scalp growing hair at the rate of about 0.4mm per day (about 1.2cm per month). The shape of the follicle partly determines whether we have straight or curly hair.

Hair itself is made mostly of tough, structural proteins called keratins which also form the nails and, in other animals, things like horns, beaks, claws, and sometimes exoskeletons. Silk is also related. Only mammals have hair. Because hair is made of protein you’ll sometimes get advised to check your protein intake if you’re suffering hair loss. We’re not sure that’s a big concern.

Each hair follicle goes through a hair growth lifecycle which is more interesting than it sounds so bear with me. There’s anagen (growth), catagen (regression), and telogen (resting) and then it’s back around to anagen. It’s at the end of telogen (resting) that the hair is normally shed… up to 100 hairs a day is normal.

Long hair pic courtesy asobitsuchiya on Flickr

So that answers the question of why hair on some parts of your body is longer than others, and how come you can’t grow your hair longer and longer forever. The length of your hair is determined by how long that whole lifecycle is. A typical scalp hair follicle spends between 2 to 7 years in anagen (growth), making the normal maximum hair length about a metre. For eyebrows the growth phase ends after at most 7 months.

The sudden loss of hair about three months after a big shock, telogen effluvium, happens because all the hair follicles go into telogen (resting) together at the time of the shock, and after that ends, all the hair falls out at once.

By far the most common cause of thinning hair and eventually baldness is male pattern baldness and female pattern baldness and they are both caused by the same thing… a genetic sensitivity to a chemical derivative of testosterone. The result is that each time the hair follicle comes back around to anagen (growth) the hair is a little thinner and the follicle weaker until one time, no hair is produced at all.

So long as this is caught in time, hair growth can be preserved and baldness prevented. No, really, it’s official… the FDA has approved two drugs for this purpose. Minoxidil is available to men and women and it stimulates blood flow and by means unknown, gets hair growing again. Propecia is only available for men, and that blocks the effect of testosterone on hair follicles. If you’re a man, you get to use both at the same time for best effect. But women don’t despair… it’s possible to get minoxidil containing testosterone blockers that work similarly (but unfortunately not as effectively) to Propecia.

Remember that when using these treatments it’s important that your hair growth progress is monitored by a specialist in order to ensure optimum response and safety whilst using these treatments. And there are other hair loss products that can be used to maximise the results of the proven treatments and are always recommended.

The trick to retaining hair growth is catching thinning hair early. There’s not a lot that can be done to revive hair follicles that have ceased to function. But those still working can be stimulated and revived.

To find out about the most effective treatment options for hair loss, that will prevent and reverse it in most cases message us or give the centre a call on 020 7730 6666. You can arrange a free consultation at the UK’s leading hair loss clinic or alternatively complete our online diagnostic form for Belgravia’s home-use mail order hair loss service.

(Long hair pic courtesy asobitsuchiya on Flickr)

This entry was posted on Wednesday, November 5th, 2008 at 3:34 pm and is filed under General Hair Loss. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.

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2 Responses to “The Basics of Hair Growth”

  1. Sophie Says:

    Hi Heather,
    Thanks for your question.
    You find the answer here: http://www.belgraviacentre.com/blog/is-there-an-upper-age-limit-for-treating-hair-loss-in-women/
    I hope this helps,
    Sophie

  2. heather davey Says:

    up to what age do you recommend treatment for female pattern baldness ?

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