The Physical Signs of Burnout
Updated: Sep 20
What Your Nervous System Is Trying to Tell You
Burnout doesn't start in your head.
By the time it feels like exhaustion or flatness, your nervous system has usually been signalling for a while — through your jaw, your neck, your eyes, your ears, and how you cope with an ordinary day.
Most people miss these signals. A tight jaw becomes “I must be grinding my teeth.” Noise sensitivity becomes “I'm just tired.” Dreading the office becomes “I'm not a people person right now.”
On their own, none of these seem like much. Together, they're often the nervous system stuck in overdrive.
Essentially, your body runs on two gears: go and rest.
The sympathetic nervous system is “go” — it mobilises you for activity and short-term stress. The parasympathetic system is “rest” — recovery, digestion, sleep, repair. In a healthy system, you move between the two depending on what's actually happening. Both ‘fight or flight’ and ‘rest and digest’ work synergistically together; both are needed to meet the demands of the day.
Chronic stress — back-to-back demands with no real recovery window keeps the system stuck in “go” far longer than it's built for. The physical signs usually show up before the psychological ones.
What that can look like
Jaw and neck tension that doesn't ease with a massage, because the trigger isn't muscular
Sensitivity to light or noise that wasn't there before
Feeling wired but tired — unable to relax even when exhausted
Needing to recover after socialising, even with people you enjoy
A general sense of being overloaded, without one clear cause
None of these are diagnoses on their own. But as a pattern, they're worth paying attention to.
What the research shows
People with clinical burnout tend to show reduced heart rate variability (HRV) — reduced vagal tone, specifically.
Lennartsson et al. found lower HRV in burnout patients than in healthy controls.
Wekenborg et al. tracked participants for a year and found lower vagal tone predicted worse burnout symptoms, including emotional exhaustion, a year later.
The mechanism isn't settled. A 2021 review by Sjörs Dahlman, Jonsdottir and Hansson found mixed results across studies — heightened stress-system activity early on in some, blunted responses once burnout is established in others.
Why this matters
These physical signs tend to show up long before most people seek help — usually once exhaustion is already affecting work or relationships.
An autonomic nervous system assessment looks at how your system is functioning, not just what you're reporting. It's the same kind of assessment used with post-concussion and POTS patients, applied here to catch dysregulation before it progresses.
The bigger picture
A nervous system stuck in “go” for months or years doesn't just affect how you feel on a given day. It affects concentration, decision-making, and how much you have left in reserve — the things a demanding career actually runs on.
Managing it isn't separate from performing well or staying in the work you've built a career around. It's part of what makes that sustainable long-term.
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References
1. Lennartsson AK, Jonsdottir I, Sjörs A. Low heart rate variability in patients with clinical burnout. Int J Psychophysiol. 2016 Dec;110:171-178. PMID: 27535344
2. Wekenborg MK, Hill LK, Thayer JF, Penz M, Wittling RA, Kirschbaum C. The Longitudinal Association of Reduced Vagal Tone With Burnout. Psychosom Med. 2019 Nov/Dec;81(9):791-798. PMID: 31592938
3. Sjörs Dahlman A, Jonsdottir IH, Hansson C. The hypothalamo-pituitary-adrenal axis and the autonomic nervous system in burnout. Handb Clin Neurol. 2021;182:83-94. PMID: 34266613
