Burnout symptoms: four core signs research has found, plus sleep and body signs

In its International Classification of Diseases (ICD-11), the World Health Organization (WHO) defines burnout as “a syndrome conceptualized as resulting from chronic workplace stress that has not been successfully managed” and names three dimensions: feelings of energy depletion or exhaustion; increased mental distance from one’s job, or feelings of negativism or cynicism related to one’s job; and reduced professional efficacy. The WHO classifies burnout as an occupational phenomenon, not a medical condition (WHO, 2019).

So burnout symptoms are broader than “very tired”. The researchers who built the Burnout Assessment Tool (BAT) interviewed 49 practitioners who work with burnout and validated the tool in a representative sample of 1,500 Flemish employees in Belgium (Schaufeli et al., 2020). Exhaustion was the most obvious symptom, named by every practitioner, yet they saw it as necessary but not sufficient for burnout. What matters is whether exhaustion comes with pulling away from work, and with concentration and emotions that are harder to manage than before.

Drawing on these studies, this guide covers the four core symptoms, signs in sleep and the body, what follow-up studies found after burnout, and how to read the mind.io burnout self-check. Telling burnout from depression has its own guide, burnout versus depression. None of this is a diagnostic checklist; it is a map for seeing what your exhaustion looks like right now.

1. Exhaustion. A severe loss of energy, both physical and mental. The 12-item BAT asks about it with statements such as “At work, I feel mentally exhausted” (Brassey et al., 2026). The mind.io item “Are you exhausted in the morning at the thought of another day at work?” looks in the same direction.

2. Mental distance. Withdrawing from your job and detaching from it psychologically. ICD-11 describes it as increased mental distance from one’s job, or feelings of negativism or cynicism related to it. The BAT researchers see it as a way of coping with exhaustion, but an ineffective one: it adds stress at work, for instance through conflicts with colleagues or clients, and so deepens the exhaustion. A BAT-12 example item is “I’m cynical about what my job means to others”.

3. Cognitive impairment. A reduced capacity to regulate thinking processes such as memory and attention. Example item: “When I’m working, I have trouble concentrating.”

4. Emotional impairment. A reduced capacity to regulate emotions such as anger or sadness. Example item: “At work, I may overreact unintentionally.” The BAT researchers trace both impairments to a lack of energy, which is why they put depleted energy at the center of the four.

Reduced professional efficacy, ICD-11’s third dimension and the sense of not getting your job done, is not on this list. The Maslach Burnout Inventory (MBI), estimated to be used in 88% of publications on burnout, scores it alongside exhaustion and cynicism, but the practitioners interviewed for the BAT saw it as a consequence of burnout rather than part of it (Schaufeli et al., 2020). If you feel you have not been doing your job well lately, check whether any of the four changes above sit underneath.

The BAT researchers also describe three secondary symptoms that accompany the core ones: depressed mood, as a common reaction to disappointment or loss; psychological distress, unpleasant high-arousal feelings that interfere with daily activities; and psychosomatic complaints, physical symptoms thought to be caused or worsened by psychological factors. The secondary-symptom items ask about things such as trouble falling or staying asleep, worrying, feeling tense and stressed, anxiety, palpitations or chest pain, stomach or intestinal complaints, headaches, muscle pain and getting sick often (Vinueza-Solórzano et al., 2026).

They count as secondary because they are atypical and can also appear in other physical and mental conditions, such as hyperthyroidism, cancer, mood disorders or anxiety disorders. Even so, they are often what makes people seek help. If changes in sleep, headaches or digestion persist, do not put them down to burnout alone; see a doctor to check for other causes.

Sleep and burnout can feed each other. In a study of 1,356 apparently healthy employed adults surveyed at routine health checkups about 18 months apart, burnout at the first survey significantly predicted new cases of insomnia 18 months later (odds ratio 1.93), and insomnia in turn predicted new cases of burnout (odds ratio 1.64), with depressive symptoms, neuroticism, age, sex and other factors controlled (Armon et al., 2008). If your sleep starts to slip, take it as a reason to look at burnout; if you are already worn out, take it as a reason to protect your sleep.

Since trouble with concentration and memory is one of the core symptoms, researchers have asked whether it shows up on actual tests. Deligkaris et al. (2014) systematically reviewed 15 English-language studies, published between 2005 and 2013, that measured cognitive functioning with psychometric tests rather than self-reports.

Burnout was associated with declines in three main cognitive functions: executive functions (planning and regulating), attention and memory. The authors saw this as especially relevant for jobs that combine high work pressure with high cognitive demands.

Because the studies were few and varied, the authors said longitudinal studies are needed to find out which functions are mainly affected and whether burnout is the cause. So the sense that your brain is not what it was may be more than a feeling, but on its own it is not proof of burnout either. If the changes are turning into mistakes at work, that is a sign to talk about adjusting your workload and deadlines (burnout recovery guide).

Salvagioni et al. (2017) systematically reviewed prospective studies, which measure burnout first and then follow people’s health and work. Of 993 articles initially found, 61 met the inclusion criteria, and the 36 that also met three requirements for prospective studies were analyzed.

Burnout significantly predicted outcomes in three areas. Physical: hypercholesterolemia, type 2 diabetes, coronary heart disease, musculoskeletal pain, prolonged fatigue, headaches, gastrointestinal issues and respiratory problems, among others. Psychological: insomnia, depressive symptoms, use of psychotropic and antidepressant medication, and hospitalization for mental disorders, among others. Occupational: job dissatisfaction, absenteeism, new disability pensions and presenteeism (working while unwell), among others.

This means these outcomes followed more often in groups with burnout, not that they will happen to everyone who is burned out, and the authors noted conflicting findings between studies. Still, as the authors concluded, it is a reason to notice burnout early and to prevent it.

The mind.io burnout self-check uses the Copenhagen Burnout Inventory (CBI): 6 personal burnout items and 7 work-related burnout items, each scale scored from 0 to 100. Below 50 reads as “Low burnout”, 50 to 74 as “Moderate burnout” and 75 or more as “High burnout”. The CBI developers’ norms document (Borritz & Kristensen, 2004) used 50 or more as the mark of high burnout, and splitting 50 to 74 from 75 or more is a convention in several CBI studies; these are reading aids, not diagnostic thresholds. You can see how other people score in average burnout score.

The CBI measures burnout mainly as fatigue and exhaustion. When the BAT researchers compared existing burnout questionnaires, they grouped the CBI with those that restrict burnout to exhaustion (Schaufeli et al., 2020). So your score mostly reflects the first of the four core symptoms. Whether you have pulled away from work, and whether your concentration and emotions are as manageable as before, are worth checking against this guide apart from the score.

If your score is high and several core symptoms overlap, start by looking at your workload and role (burnout recovery guide). If, away from work too, a low mood or little enjoyment has gone on nearly every day for more than two weeks, it may be more than burnout: try the depression check-in (PHQ-9) and talk to a professional.

Q. What are the early signs of burnout? A. ICD-11 lists three dimensions of burnout but no separate “early symptoms”. The BAT development paper does cite a longitudinal study using the MBI (Taris et al., 2005) in which exhaustion led to cynicism, and cynicism in turn to reduced professional efficacy. If ongoing exhaustion comes with cooling toward your work, that is worth looking at early.

Q. Is burnout an illness? A. The WHO classifies burnout as an occupational phenomenon, not a medical condition. But as the follow-up studies above show, many physical and mental health problems followed more often in people with burnout, so it is not something to brush off.

Q. Can you burn out without a job? A. The WHO reserves the term burnout for the occupational context. The BAT researchers, however, do not limit “work” to paid employment: they take it to mean structured, goal-directed activities that are mandatory, so students, athletes and volunteers can burn out too. They also mention the claim that parents can suffer from burnout (Schaufeli et al., 2020).

Q. When should I get help? A. If a low mood keeps going, talk to a professional. If you have thoughts of harming yourself, treat it as a mental health crisis rather than burnout and reach out to a crisis line right away: 988 in the US and Canada (call or text), Samaritans on 116 123 in the UK and Ireland, or findahelpline.com elsewhere. If you are in immediate danger, contact your local emergency services.

References: World Health Organization (2019), Burn-out an “occupational phenomenon”: International Classification of Diseases, https://www.who.int/news/item/28-05-2019-burn-out-an-occupational-phenomenon-international-classification-of-diseases; Schaufeli, W. B., Desart, S., & De Witte, H. (2020), Burnout Assessment Tool (BAT)—Development, validity, and reliability, International Journal of Environmental Research and Public Health 17(24), 9495, https://doi.org/10.3390/ijerph17249495; Brassey, J., De Beer, L. T., Merkand, R., Herbig, B. A., Schaufeli, W. B., De Witte, H., & Rubenstein, K. (2026), Measurement invariance alignment of the burnout assessment tool (BAT-12) across 29 countries and six continents, Scientific Reports 16, 19806, https://doi.org/10.1038/s41598-026-50601-3; Vinueza-Solórzano, A. M., Rodrigues, J. C., de Freitas, C. P. P., Schaufeli, W. B., De Witte, H., Vazquez, A. C. S., & Portalanza-Chavarria, C. A. (2026), Validity evidence for the secondary symptoms of the Burnout Assessment Tool: A Brazilian study, International Journal of Environmental Research and Public Health 23(3), 302, https://doi.org/10.3390/ijerph23030302; Armon, G., Shirom, A., Shapira, I., & Melamed, S. (2008), On the nature of burnout–insomnia relationships: A prospective study of employed adults, Journal of Psychosomatic Research 65(1), 5-12, https://doi.org/10.1016/j.jpsychores.2008.01.012; Deligkaris, P., Panagopoulou, E., Montgomery, A. J., & Masoura, E. (2014), Job burnout and cognitive functioning: A systematic review, Work & Stress 28(2), 107-123, https://doi.org/10.1080/02678373.2014.909545; Salvagioni, D. A. J., Melanda, F. N., Mesas, A. E., González, A. D., Gabani, F. L., & de Andrade, S. M. (2017), Physical, psychological and occupational consequences of job burnout: A systematic review of prospective studies, PLoS ONE 12(10), e0185781, https://doi.org/10.1371/journal.pone.0185781; Taris, T. W., Le Blanc, P. M., Schaufeli, W. B., & Schreurs, P. J. G. (2005), Are there causal relationships between the dimensions of the Maslach Burnout Inventory? A review and two longitudinal tests, Work & Stress 19(3), 238-255, https://doi.org/10.1080/02678370500270453; Kristensen, T. S., Borritz, M., Villadsen, E., & Christensen, K. B. (2005), The Copenhagen Burnout Inventory: A new tool for the assessment of burnout, Work & Stress 19(3), 192-207, https://doi.org/10.1080/02678370500297720; Borritz, M., & Kristensen, T. S. (2004), Copenhagen Burnout Inventory: Normative data from a representative Danish population on Personal Burnout and Results from the PUMA study on Personal Burnout, Work Burnout, and Client Burnout, National Institute of Occupational Health, Denmark, https://nfa.dk/media/hl5nbers/cbi-first-edition.pdf.