“Stress causes grey hair.”

The idea that intense stress can turn hair prematurely gray has been a popular notion for centuries, often appearing in folklore and historical anecdotes, such as the legend of Marie Antoinette's hair supposedly turning white overnight before her execution. For a long time, this widespread belief was largely considered an old wives' tale, lacking concrete scientific evidence, even though many people observed a correlation between stressful life events and the appearance of gray hairs. The visible changes in leaders' hair during their time in office, for instance, often fueled this common assumption.

Recent scientific studies have now provided compelling evidence, confirming that severe stress can indeed contribute to hair graying. Researchers have discovered that stress can impact the melanocyte stem cells, which are responsible for producing the pigment that gives hair its color. When the body experiences stress, the sympathetic nervous system, responsible for the "fight or flight" response, releases a chemical called norepinephrine into the hair follicles. This chemical causes the pigment-regenerating stem cells to activate excessively and migrate out of the follicle, prematurely depleting their supply. Without these stem cells, new hair grows in without pigment, appearing gray or white.

This phenomenon is commonly believed because the effects of stress are often outwardly visible and deeply felt. People frequently notice new gray hairs after periods of significant emotional or physical strain, making the connection seem intuitive and real. The scientific confirmation provides a biological basis for these long-held observations, explaining why a belief rooted in anecdotal evidence has now been validated by modern research. Interestingly, some research even suggests that if the stress is eliminated, this process of graying can, in some cases, be at least partially reversible, allowing some hairs to regain their original color.