Burnout rarely arrives as a single dramatic event.
For most people, it builds over months of sustained pressure, unclear expectations, and limited recovery.

The World Health Organization recognises burnout as an occupational phenomenon. In its 2019 International Classification of Diseases update, burnout is described as a syndrome resulting from chronic workplace stress that has not been successfully managed, with three elements: exhaustion, increased mental distance or cynicism, and reduced professional effectiveness.

A 2025 review in Frontiers in Public Health, led by Dr Stefanos Karakolias, examined 45 studies on burnout in high demand roles. It found that early warning signs often appear long before formal diagnosis, yet remain easy to miss. The review encourages organisations to focus on early behavioural indicators and structured recognition strategies.

Leaders are not clinicians, and OPDEV does not offer clinical advice. Leaders do, however, have daily access to behavioural information. Noticing that information early can make a meaningful difference.

Behavioural signs to pay attention to

Every person is different, although certain patterns appear frequently in the research and practice literature.

You may see:

A drop in energy that does not recover
Someone who was usually steady begins to appear constantly tired, even after rest periods or quieter weeks. They may describe feeling “empty” at the start of the day.

Quiet withdrawal from informal contact
A colleague who used to contribute actively becomes quieter, declines optional conversations, or leaves discussions as soon as formal business ends. This often reflects emotional distancing.

More small errors and lapses
Burnout can affect memory and concentration. Increased mistakes, missed details, or difficulty tracking tasks, especially in people who take pride in their work, can signal strain.

Rising irritability or cynicism
Comments become sharper, patience shortens, and hope about change fades. The person may express that extra effort will not alter outcomes.

Keeping up a strong front while feeling depleted
Several recent articles describe a pattern sometimes called “quiet cracking”, where people continue to perform outwardly, while feeling they cannot sustain the effort.

No single sign confirms burnout. The pattern over time matters more than any one moment.

How to start a careful conversation

When you notice a pattern, a calm, private conversation helps.

You can:

• Arrange time in a quiet space, without rushing

• Describe what you have observed in simple, neutral language

• Ask how work has been feeling, then listen without interruption

For example:

“Over the last few weeks I have seen you looking very tired in our meetings and speaking less in discussions. I wanted to check how work is landing for you at the moment.”

Karakolias’s 2025 review highlights the importance of leaders who take early signs seriously and open conversations without judgement. This approach supports earlier adjustments in workload, support, and expectations.

System questions for leaders

Burnout is personal in its impact, and systemic in its causes.

Evidence summaries from organisations such as IMD Business School and WSM Wellbeing highlight several consistent risk factors: sustained overload, low control, unclear expectations, and limited recognition.

As a leader, you can ask:

• Where have demands increased for this person or team

• How much control do they have over how they meet those demands

• How clear are the current priorities, especially during change

• Where do they receive recognition or constructive feedback

Small changes, such as pausing low value work, clarifying ownership, or adjusting timings, can reduce pressure while you explore deeper shifts.

Protecting performance by protecting people

Beyond health concerns, burnout affects performance through higher absence, reduced engagement, and slower learning. A 2024 special issue on worker burnout in Workplace Health & Safety underlines the cost of untreated burnout for both individuals and organisations, especially in high pressure roles.

OPDEV works with burnout as part of the Hidden Operating System. Through the ONN audit, we identify where workload, expectations, trust, and communication combine to create sustained strain. HPI workshops then focus on:

• Clearer prioritisation and workload design

• Team agreements about availability and response times

• Leader behaviours that make it safe to raise pressure early

The aim is straightforward. Fewer people reaching exhaustion, more teams able to sustain performance with steadiness over time.