Is acute stress good for your immune system?

Research reviewed by Firdaus Dhabhar suggests stress lasting minutes to hours can enhance immune responses, while stress lasting weeks to months tends to suppress or dysregulate them. This does not mean seeking out stress is a health strategy.

Does Wim Hof breathing boost immunity?

In a 2014 trial, 12 people trained for 10 days in breathing, cold exposure and meditation had higher adrenaline, more anti-inflammatory signaling and fewer flu-like symptoms after an endotoxin injection than 12 untrained controls. It was a small trial of a combined program, and the breathing carries fainting and drowning risk.

Is adrenal fatigue real?

A 2016 systematic review of 58 studies found no evidence supporting adrenal fatigue as a condition. Adrenal insufficiency is a real, diagnosable medical disorder that is different.

How can I tell when stress has become chronic?

Huberman offers a rule of thumb: when stress stops you sleeping well, it has become chronic. It is a heuristic, not a clinical definition.

Is Short-Term Stress Good for You? Acute vs Chronic Stress Explained

Short bursts of stress, lasting minutes to hours, mobilize the body. Research shows they can sharpen attention and even enhance immune responses. Stress that persists for weeks or months is a different story: it is linked with suppressed immunity, poorer sleep and higher cardiovascular risk. The useful skill is switching the stress response on when needed and off again afterwards.

This page is general information, not medical advice. It does not cover anxiety disorders or depression; see a qualified clinician for those.

Three time scales of stress

On the Huberman Lab episode on stress and anxiety, Andrew Huberman sorts stress into three time scales and offers different tools for each:

Short-term: seconds to hours, such as a deadline, a hard workout or a cold shower.
Medium-term: days to weeks, such as a demanding exam period or project.
Long-term: months or more of sustained stress.

He also gives a practical marker: stress has crossed into chronic territory when it stops you sleeping well. That is a heuristic rather than a research definition, but it fits the evidence that poor sleep and chronic stress feed each other.

Tools by time scale, and how strong the evidence is

Time scale	Tool discussed	Best evidence	Strength
Seconds to minutes	Exhale-focused breathing (physiological sigh)	Randomized trial and breathwork meta-analysis	Moderate, small effects
Minutes to hours	Deliberate short stress (cold, fast breathing)	Kox et al., 2014, 24 volunteers, immune response	Small single study
Days to weeks	Staying calm under physical arousal; panoramic vision	Mouse visual-threat circuit study	Animal only
Months	Social connection	Meta-analysis of 148 studies	Observational
Months	Gratitude practice	Emmons and McCullough, 2003	Small experiments

Short-term stress: why it can help

The stress response is generic. The same adrenaline surge shows up whether the trigger is physical or psychological. In a review titled “Effects of stress on immune function: the good, the bad, and the beautiful”, researcher Firdaus Dhabhar summarizes evidence that stress lasting minutes to hours enhances both innate and adaptive immune responses. It does this by changing how immune cells traffic, mature and function. Long-term stress has the opposite effect: it suppresses or dysregulates immunity and promotes low-grade chronic inflammation.

Huberman goes further and calls short-term stress the most powerful nootropic. That is a memorable line rather than a measured finding. Short-term arousal can narrow focus, but there is no trial ranking stress against cognitive enhancers.

The Wim Hof endotoxin study

Huberman points to a 2014 PNAS study by Kox and colleagues. Twelve healthy volunteers trained for 10 days in meditation, cyclic hyperventilation with breath retention, and cold-water immersion. Twelve controls did not train. All 24 were then injected with bacterial endotoxin. In the trained group, practicing the techniques sharply raised blood adrenaline. Their anti-inflammatory signaling (IL-10) rose faster, their pro-inflammatory cytokines were lower, and they reported fewer flu-like symptoms.

Huberman described the trained group as having essentially no symptoms. The paper reports lower symptoms, not none. The program also bundled cold exposure and meditation with the breathing, so it does not show the effect of breathing alone. For the cold side of this, see the cold and heat exposure guide.

Safety: fast breathing with breath holds can cause blackouts. Huberman warns never to do it anywhere near water. Avoid it in baths, pools, open water and while driving. Get medical advice first if you are pregnant or have heart, lung, seizure or eye-pressure conditions.

Medium-term stress: raising your threshold

For stretches of days to weeks, Huberman suggests practicing calm under physical arousal. You raise your heart rate deliberately, for example with hard intervals, and then work on keeping your mind calm. One technique he suggests is widening your gaze to panoramic vision. He acknowledges there is limited research on this. The lab work he draws on is a mouse study of visual threat circuits, not a human trial of panoramic vision. Treat it as an idea to experiment with, not an established method.

Real-time tools with better human data include exhale-focused breathing; see the physiological sigh protocol.

Related protocols: cold plunge and non-sleep deep rest (NSDR).

Long-term stress: what protects you

Chronic stress is linked with poor sleep and immune dysregulation in the research above. The basics matter most: sleep, regular exercise and sensible caffeine habits. Two further levers come up in the episode.

Social connection. Huberman calls social connection central to buffering long-term stress. Human evidence supports the broader point. A meta-analysis of 148 studies with 308,849 participants found people with stronger social relationships had 50% higher odds of survival over follow-up. These studies are observational, so they show association rather than proof of cause.

The tachykinin story. Huberman highlights tachykinin, a brain peptide he links to the harms of isolation. The supporting study is in mice: Zelikowsky and colleagues (2018) found that 2 weeks of social isolation, but not 24 hours, raised the peptide Tac2 throughout the brain and drove aggression and persistent fear-like behavior. Blocking its receptor prevented most of these effects. Whether the same mechanism operates in humans is not established.

Gratitude. Huberman suggests writing down things you are thankful for and ties it to serotonin. The classic Emmons and McCullough experiments found gratitude listing improved well-being. They did not measure serotonin, so the brain-chemistry link is speculation.

The adrenal burnout myth

Huberman is emphatic that adrenal burnout does not exist. Endocrinology research agrees. A 2016 systematic review of 58 studies found no substantiation for “adrenal fatigue” as a condition. Feeling exhausted after long stress is real, but it is not caused by worn-out adrenal glands. Adrenal insufficiency, by contrast, is a genuine medical condition diagnosed with proper testing.

The idea of a stress “exhaustion” phase traces back to Hans Selye’s general adaptation syndrome. Huberman calls Selye a Nobel Prize winner. In fact the Nobel nomination archive lists him as nominated 17 times between 1949 and 1953, and he was never awarded the prize.

Supplements for chronic stress

Huberman mentions ashwagandha and L-theanine as occasional aids during high-stress periods. We cover the trials and safety issues in ashwagandha for stress and L-theanine for stress. For the wider picture, see the focus and cognition guide.