What is burnout, and how is it different from stress?
Burnout is a specific occupational syndrome, not a synonym for being very tired or very stressed — and the distinction matters because the responses that help are different.
The definition. The World Health Organization classifies burnout in ICD-11 as an occupational phenomenon resulting from chronic workplace stress that has not been successfully managed. It is explicitly not classified as a medical condition, and is defined as relating to the occupational context specifically. Three dimensions:
Exhaustion — energy depletion that rest does not resolve.
Mental distance from the job, or feelings of negativism and cynicism about it. This is the dimension people recognise least in themselves and colleagues notice first.
Reduced professional efficacy — a sense of ineffectiveness, frequently disproportionate to actual performance.
How it differs from stress:
Stress involves over-engagement; burnout involves disengagement. Stress is urgency and over-reaction; burnout is flatness and detachment.
Stress produces anxiety; burnout produces cynicism and emotional blunting.
Stress feels like too much; burnout feels like not enough — not enough capacity, not enough meaning.
Rest resolves stress. Rest alone does not resolve burnout, which is the most practically important difference and why "take a holiday" so often fails.
Depression is a distinct clinical condition that extends across all areas of life, whereas burnout is defined in relation to work. They overlap and can co-occur, and distinguishing them is a clinical matter rather than a self-assessment one.
What the research points to on causes. The evidence consistently implicates workplace factors more than individual resilience: unsustainable workload, lack of control, insufficient reward, breakdown of community, absence of fairness, and value conflict. This is why individual wellbeing interventions have a modest record when the underlying conditions are unchanged.
If this is where you are, it is worth speaking to your GP — persistent exhaustion has many possible causes, some medical, and self-diagnosis is unreliable. This is explanatory information, not a diagnosis.