Limited evidence suggests stress may accelerate hair graying, but the relationship is not definitively established.
Current research provides some support for a stress-hair graying connection, with one study showing higher stress levels were associated with earlier onset of premature graying before age 25. However, the evidence is primarily observational and the mechanisms linking psychological stress to hair pigmentation loss remain unclear. Most studies focus on related factors like oxidative stress and cortisol rather than direct stress-graying relationships.
Caveats
Most evidence is observational rather than experimental, and studies often confound psychological stress with other factors like genetics, nutrition, and oxidative stress.