SubEx

A promising finding

Why stress can raise cortisol and inflammation at the same time

Across 41 studies in mice, monkeys and people, long-running stress may leave immune cells less responsive to cortisol's anti-inflammatory signal, with inflammation rising even when cortisol is high.

Cortisol

Cortisol is the body's own anti-inflammatory, so high cortisol alongside high inflammation looks wrong. Across 41 studies in mice, monkeys and people, it is not: long-running stress leaves immune cells less responsive, and inflammation rises anyway. The same failing feedback turns up alongside autoimmune disease, though that half is a narrative review and the arrow could run either way. This is about how cells answer the hormone, so a blood cortisol reading cannot tell you it is happening.

The findings behind this

1↑
ImmuneLong stress may leave immune cells less able to hear cortisol

Across 41 studies in mice, monkeys and people, long-running stress left immune cells less responsive to cortisol's anti-inflammatory signal, and inflammation rose anyway.

★★★Well replicated — this finding’s sources average out to meta-analyses, systematic reviews or high-powered trials.The mechanism is shown far more directly in the animal studies than in the human ones, where nobody has followed it over time. And this is about how cells respond rather than how much hormone is present, so a blood cortisol reading says nothing about whether it is happening.Click to keep this openSupport immunityCortisol
2↑
ImmuneThe folk idea that stress makes you ill has a mechanism under it

Chronic stress wears down cortisol's own off-switch and leaves cells less able to answer the hormone. That pattern turns up alongside lupus, rheumatoid arthritis and multiple sclerosis.

★★☆Single study — solid evidence, such as one good trial or a large observational dataset, but not replicated at the top tier.This is a narrative review drawing human and animal work together, not new data. And the arrow could run either way: a stress-disrupted cortisol system might raise autoimmune risk, or years of autoimmune illness might be what disrupts the system. Nothing here separates the two.Click to keep this openSupport immunityCortisol

More on this

All stories →