Burnout
Burnout is an occupational phenomenon -- not a medical diagnosis -- resulting from chronic unmanaged workplace stress, per the World Health Organization ICD-11 classification.
Symptoms
Feelings of energy depletion or exhaustion, increased mental distance from or cynicism about one's job, and reduced professional effectiveness -- the three dimensions of the WHO's definition.
Causes and risk
Chronic workplace stress that has not been successfully managed; the evidence base is heavily drawn from healthcare workers, per physician burnout research, though it applies more broadly.
How it is evaluated
There is no lab test or universal diagnostic criteria; validated tools like the Maslach Burnout Inventory help gauge severity, and screening for comorbid depression or anxiety is an important part of evaluation since burnout is distinct from, but can overlap with, those conditions.
Treatment
CBT and mindfulness-based interventions are the best-supported approaches; no medication treats burnout itself, though medication may help a co-occurring condition, per Cochrane review data.
When to seek care
Burnout carries a documented link to suicidality. Any thoughts of self-harm should prompt immediate crisis support via 911 or the 988 Suicide and Crisis Lifeline.