Why do some people go bald?

What do Charles Darwin, Michael Jordan, and Yoda have in common?
They, like many other historical and fictive individuals, are bald, in some cases by their own choice.

For centuries, a shining dome has been a symbol of intelligence, but despite this, many balding people still wish their hair would return.

“Why do some people lose their hair, and how can we bring it back?”

A full head of hairs have about 100,000 to 150,000 hairs on the scalp, and scientists have discovered two things about this dense thicket.

  • Firstly, the sprouting hair we see is mostly made up of keratin, the protein leftover from dead cells that are forced upwards as new cells grow beneath them.
  • Secondly, the structures that drive hair growth are called hair follicles, a network of complex organs that forms before we’re born and grow hair in an everlasting cycle.

This cycle has three main phases.

The Growth Phase

The first is anagen, the growth phase, which up to 90℅ of your hair follicles are experiencing right now, causing them to push up hair at a rate of one centimeter per month. Anagen can last for two to seven years, depending on your genes.

The Regressing Stage

After this productive period, signals within the skin instruct some follicles to enter a new phase known as catagen or the regressing stage, causing hair follicles to shrink to a fraction of their original length. Catagen lasts for about two to three weeks and cuts the blood supply to the follicle, creating a club hair, meaning it’s ready to be shed.

The Resting Phase

Finally, hairs enter the telogen, the resting phase, which lasts for ten to twelve weeks, and affects about 5-15℅ of your scalp follicles. During telogen, up to 200 club hairs can be shed in a day, which is quite normal. Then, the growth cycle begins anew.

But not all heads are hairy and in fact, some of them grow increasingly patchy over time in response to bodily changes.

Male Pattern Baldness

95℅ of baldness in men can be attributed to male pattern baldness. Baldness is inherited and in people with this condition, follicles become incredibly sensitive to the effects of dihydrotestosterone, a hormonal product made from testosterone.

DHT causes shrinkage in these overly sensitive follicles, making hair shorter and wispier. But loss isn’t sudden. It happens gradually, along with a metric known as the Norwood Scale, which describes the severity of hair loss.

First, hair recedes along the temples, then the hair on the crown begins to thin in a circular pattern. At the highest rating on the scale, these balding areas meet and expand dramatically, eventually leaving only a ring of sparse hair around the temples and the back of the head.

Stress

Genetics isn’t all that drives hair loss, a long period of stress can release signals that shock follicles and force them into the resting phase prematurely. Some women experience this after childbirth.

Is Baldness permanent?

Follicles might also lose the ability to go into anagen, the growth phase, people going through chemotherapy treatment temporarily experience this. But while balding may look permanent scientific investigation has revealed the opposite.

  • Below the skin surface, the roots that give rise to our hair actually remain alive.
  • Using this knowledge, scientists have developed drugs that shorten the resting phase and force follicles into anagen.
  • Other drugs combat male pattern baldness by blocking the conversion of testosterone to DHT so that it doesn’t affect those sensitive follicles.

Stem Cells

Stem Cells also play a role in regulating the growth cycle, and so scientists are investigating whether they can manipulate the activity of these cells to encourage follicles to start producing hair again, and in the meantime, while scientists hone their hair-reviving methods, anyone going bald or considering baldness, can remember that they’re in great company.

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