Constant tiredness is not always burn-out: the WHO definition and when to seek help

About 12 billion working days are lost every year. The World Health Organization (WHO) estimates that depression and anxiety cause around 12 billion lost working days a year, at a cost of about US$1 trillion in lost productivity.

However, those figures concern depression and anxiety, not burn-out. Many people call any long-term tiredness burn-out and treat the two as the same thing, which is what this article sets out to separate: what counts as occupational burn-out, when to talk to your manager, and when to see a doctor.

How the WHO defines burn-out

On 28 May 2019, the WHO announced that burn-out had been included in the 11th revision of the International Classification of Diseases (ICD-11). The definition turns on its cause: it results from chronic workplace stress that has not been successfully managed.

The WHO classifies it as an "occupational phenomenon" (see the WHO's ICD frequently asked questions) and states explicitly that it is not classified as a medical condition.

According to ICD-11, burn-out has 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.
• Reduced professional efficacy.

Exhaustion is only one of the three dimensions. Tiredness alone is not enough to describe burn-out as the WHO characterises it.

Three lines between ordinary tiredness and occupational burn-out

The first line is context. The WHO says the concept refers specifically to phenomena in the occupational context and should not be applied to describe experiences in other areas of life.

The second line is time. The UK's National Health Service (NHS) says burn-out can build up gradually and describes it as physical and mental exhaustion. Signs the NHS lists include:

• Feeling tired and drained.
• Feeling helpless or detached.
• Becoming more negative and withdrawing from people around you.
• Finding it hard to get things done.
• Changes in sleep or appetite.

The research literature describes symptoms in more detail. A 2018 review in the Texas Heart Institute Journal mentions insomnia, tension, impaired memory and thoughts of quitting; a 2022 article in the Journal of the Advanced Practitioner in Oncology lists headaches, muscle tension, difficulty sleeping, irritability and a reluctance to go to work.

The third line is the easiest to overlook: burn-out is not classified as a medical condition, but that does not mean it can be ignored. The sources used for this article do not discuss how these symptoms can be distinguished from other health problems, so that judgement should be left to a doctor.

Psychosocial risks at work listed by the WHO

The WHO's Mental health at work fact sheet (page dated 15 September 2026, checked on 29 October 2026) lists a number of psychosocial risks at work:

• Heavy workloads or a fast pace of work.
• Understaffing.
• Low job control.
• Discrimination and exclusion.
• Violence and harassment.
• Job insecurity.

The same fact sheet estimates that around 16% of working-age adults had a mental disorder in 2023. The WHO's guidelines on mental health at work are also not only about individuals: they cover organisational interventions, training for managers and workers, individual interventions, and return-to-work and employment support.

What you can raise with your employer

The NHS suggests talking first to someone you trust, such as a manager, a colleague, or your company's health or human resources department. A manager may be able to help agree priorities, adjust your workload or offer other support.

Drawing on the NHS advice and the prevention and support measures listed by the WHO, you can raise the following specific points:

1. Priorities: list your current work and agree the order with your manager.
2. Workload: point out exactly which parts are beyond your capacity, such as extra work caused by understaffing.
3. Flexible working: the WHO lists this as one measure for reducing risks at work.
4. Reasonable accommodations: the WHO lists these as a support measure, and you can ask whether your company has any relevant arrangements.
5. A return-to-work plan: if you have already taken time off to recover, you can discuss arrangements for coming back, which is also a support measure listed by the WHO.
6. Mechanisms for dealing with violence or harassment: the WHO recommends workplaces have these, so you can find out how your company handles such cases.

Employment law and company policy differ from place to place, so the above is general information only.

When to see a doctor

The NHS advises that when burn-out is affecting your daily life or mental health, you should seek help from your GP or contact NHS talking therapy services. The 2022 oncology journal article also advises consulting a doctor or licensed health professional if symptoms persist.

In everyday terms: if your daily life or mental health is already being affected, seek help. This article provides general information only and cannot replace a doctor's diagnosis.

Identify the source first, then speak up

Burn-out is an occupational phenomenon, not a medical condition. The WHO says it results from chronic workplace stress that has not been successfully managed, so dealing with it involves not only the individual but also how work is arranged. Work out where the tiredness comes from, raise specific requests, and let a doctor make the call where necessary.

Prices and details correct as of October 2026

This article is general health information, not medical advice. For any health concern, consult a doctor or registered health professional.