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Question 8 of 24

Daily stress level, ranked by how often you sigh dramatically:

The short answer

Large population studies link diagnosed stress-related disorders — PTSD, acute stress reaction, adjustment disorder — to higher subsequent risk of death and of cancer, even when compared against the person's own siblings. The mechanisms are thought to run through behaviour, inflammation and cardiovascular strain rather than stress killing directly.

Stress, and the great gray-hair conspiracy

💀 A grim little fact

For a century, doctors rolled their eyes at the idea that stress turns your hair gray — filed it under 'old wives' tale.' Then in 2020, a Harvard team led by Ya-Chieh Hsu caught the mechanism red-handed. Under acute stress, the sympathetic nervous system fires and dumps norepinephrine, which burns through the pigment stem cells in your hair follicles. Once they're gone, they're gone — silver forever.

The kicker: it wasn't cortisol, the hormone everyone blames. Remove the adrenal glands in mice and they still went gray. It's the nerves.

🔮 Myth vs. Morty

Myth status: busted — in your favor, kind of. The old wives were right; stress really can grey you. But there's a hopeful footnote: follow-up research suggests stress-driven graying might be partially reversible in humans when the stress lifts. So that streak might just be your body's very expensive mood ring.

Chronic stress does uglier things than hair, of course — it leans on your heart and immune system. But Morty appreciates the drama of a good stress-streak.

Sources: Zhang et al., Nature (2020), Harvard · Entertainment only — not medical advice.

Chronic stress and life expectancy: what the evidence shows

Last reviewed · compiled by the ExpireOnDate editorial team · not medically reviewed

What the research shows

  • A Swedish population-based, sibling-controlled cohort study found people diagnosed with stress-related disorders had increased subsequent all-cause and cause-specific mortality compared with their unaffected siblings.

    people diagnosed with stress-related disorders · Sweden · population-based, sibling-controlled cohort study · 2022 · The Lancet Regional Health – Europe

  • A companion Swedish sibling-controlled study found stress-related disorders associated with increased subsequent cancer diagnosis and cancer mortality.

    people diagnosed with stress-related disorders · Sweden · population-based, sibling-controlled cohort study · 2022 · European Journal of Epidemiology

What it does not show

The sibling-controlled design is unusually good at ruling out shared genetics and childhood environment, but these studies measure diagnosed stress disorders, not the ordinary background stress of a difficult week. Stress is also hard to disentangle from depression, anxiety and socioeconomic adversity, which travel with it.

Every figure on this page describes a population, not a person. Associations measured across thousands of people cannot tell any individual how long they will live, and nothing here is medical advice. If something on this page concerns you, talk to a doctor rather than a comedy website.

References

  1. Association of stress-related disorders with subsequent risk of all-cause and cause-specific mortality: A population-based and sibling-controlled cohort study. The Lancet Regional Health – Europe (2022). primary source; accessed 2026-08-15.
  2. Stress-related disorders and subsequent cancer risk and mortality: a population-based and sibling-controlled cohort study in Sweden. European Journal of Epidemiology (2022). primary source; accessed 2026-08-15.

Spotted an error or a better source? Tell us — corrections are logged and the review date updated.