Is it possible for hair to go white overnight?
Over the years my hair has changed from black to what I like to call silver (though some would say grey) and I've come to accept this as an inevitable part of ageing. Going grey is usually a gradual process, but there are some theories that suggest it's possible to go white overnight.
The idea stems from historical myth and is named Marie Antoinette Syndrome, after the queen of France who was married to Louis XVI during the French Revolution. She was captured and later beheaded during the Reign of Terror, and it's reported that her hair turned white overnight from the stress. Though I suspect Marie Antoinette had rather a lot on her mind while waiting in a French prison cell, I think going white overnight is apocryphal and an exaggeration.
This syndrome is now thought to be a variant of diffuse alopecia areata. This is an autoimmune condition in which the body's immune system mistakenly attacks the hair follicles, causing sudden hair loss. There are two reasons this can make hair appear to rapidly grey. First, the immune system tends to target pigmented hairs, leaving the white and grey ones behind. Second, when hair does grow back after this kind of loss, it often returns without its original colour.
So, though it is possible to go grey over the course of a few weeks, overnight is almost certainly a myth. What Marie Antoinette most likely experienced, was a sudden and stress-triggered loss of her darker hairs. While the story may have some truth to it, the overnight part almost certainly does not.
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References:
Oakley A, Bell H, Coulson I, Mitchell G. Alopecia areata [Internet]. DermNet; 1997, updated 2024. Available from: https://dermnetnz.org/topics/alopecia-areata