Medical myth: Stress can turn hair grey overnight

February 27, 2013 by Michael Vagg, The Conversation
You may achieve your pigmentary potential a little ahead of schedule, but you can’t go grey overnight. Credit:

The belief that nervous shock can cause you to go grey overnight (medically termed canities subita) is one of those tales which could nearly be true. There are certainly cases in medical literature of rapid greying over quite short periods of time. And reported cases go back to antiquity including such legendary figures as Thomas More and Marie Antoinette.

The biology of the phenomenon suggests that a mixture of hormones and is responsible for the myth.

There is little doubt that plausible biological mechanisms exist to account for potentially affecting hair growth. What's fascinating to me, as a pain specialist, is that several of the signalling proteins involved (such as and substance P) are the very same ones that operate in other nerves to create and regulate .

Human hair cycles between a growth phase (anagen), a resting phase (catagen) and a dormant phase (telogen). Pigment is produced by the to colour the hair during the anagen phase while it is growing.

The length of the anagen phase varies according to your genes and certain hormonal levels. It can be anything between two years and eight years. When the follicle receives orders to end the anagen phase, it stops producing more hair and begins to prepare for telogen. Telogen phase lasts for between six and eighteen months at a time before heading back into anagen.

After ten or so of these cycles the follicle runs out of pigment and produces a hair with no colour at all. Despite its white colour, we insist on referring to these as "grey hairs" for some obscure linguistic reason.

Marie Antoinette’s hair may have turned grey, but it didn’t happen overnight. Credit: Joseph Ducreux

Intense stress can cause large numbers of your follicles to hit telogen at around the same time, producing simultaneous loss of a large percentage of coloured hair. This phenomenon is known as telogen effluvium.

Telogen effluvium is often caused by drugs which affect the hormonal control of the hair cycle, including chemotherapy drugs and anti-Parkinson's drugs.

Monday’s medical myth: Stress can turn hair grey overnight
Blame pigmentary potential, not the stress of being the leader of the Free World. Credit: U.S. Air Force

Interestingly, these hormonal signals have a less potent effect on non-coloured hair, so a person could conceivably lose large amounts of coloured hair, leaving behind mostly white hair. This could also happen at a stressful time, such as the night before your execution. It can also happen due to auto-immunity (alopecia areata) where the feral antibodies target pigment-producing follicles ahead of non-pigmented ones.

The problem for the myth is that none of this can happen as suddenly as overnight.

There are also plenty of good alternative explanations for these reports. In the case of Marie Antoinette, she was seen little in public in the couple of weeks before her execution, and would also have been deprived of her wigs and servants to dye her , if indeed that was one of her guilty secrets.

People such as President Obama, who go visibly greyer during a period of extreme stress over months or years, are usually at an age where many of their unfortunate follicles are on their last pigment cycle.

Confirmation bias means we remember those stressed people who look much greyer, but don't remember those who go through such periods without visible greying.

Monday’s medical myth: Stress can turn hair grey overnight
What a difference four years can make. Credit: The White House

We also tend to ignore those who grey early and don't seem particularly stressed. That gets put down to genetics rather than stress.

So no matter how stressful your life may become, it might help to know that although you may achieve your pigmentary potential a little ahead of schedule, you can't go grey overnight.

Explore further: Probing Question: Does stress produce gray hair?

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1 / 5 (1) Feb 28, 2013
The "obscure linguistic reason" is that people's hair goes a grey colour first and white much later on. In other words the idiot who wrote this article is either blind or brain dead...In fact you can usually see the hair turn grey in a wave across the head and then later white will sweep across in the same manner...
Whydening Gyre
1 / 5 (1) Mar 02, 2013
Yeah, but.... what about red hair?
Whydening Gyre
1 / 5 (1) Mar 02, 2013
RKS - I see that you "get it"... How long til mainstream does?
not rated yet Mar 04, 2013
The "obscure linguistic reason" is that people's hair goes a grey colour first and white much later on.

Only the author wasn't describing what happens to all the hair on someone's head:
produces a hair with no colour at all.

A hair. One. The claim is that individual hairs are not grey.

In other words the idiot who wrote this article is either blind or brain dead...

If you think such harsh judgements are appropriate, consider the judgements one might apply to someone who mistakes his jumping to conclusions for someone else's idiocy.

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