The World Health Organization includes burnout in the International Classification of Diseases (ICD-11) as an occupational phenomenon, not as a medical condition. Its definition reads: "a syndrome conceptualized as resulting from chronic workplace stress that has not been successfully managed." It has three dimensions (World Health Organization):
- Feelings of energy depletion or exhaustion.
- Increased mental distance from one's job, or feelings of negativism or cynicism related to it.
- Reduced professional efficacy.
The WHO adds that the term refers specifically to work and should not be applied to other areas of life. HelpGuide, a nonprofit mental health site, notes that the WHO definition is based on the model of Christina Maslach, a pioneer of burnout research (HelpGuide). ZenFounder, a mental health resource for entrepreneurs, builds on Maslach's work and puts it simply: burnout is "no longer caring, no longer having energy, and no longer feeling like your effort matters" (ZenFounder).
HelpGuide also draws a useful line between stress and burnout. Stress is about "too much": too many pressures, while still believing that getting things under control would help. Burnout is about "not enough": feeling empty, beyond caring and without hope that things will improve. It also notes that you usually know when you are stressed, but you do not always notice burnout when it happens (HelpGuide).



