PERFORM - What burnout actually looks like before it looks like burnout
Part 3 of a 5-part series on mental fitness and sustainable performance: Perform.
By the time burnout is visible, it has usually been building for months. Not weeks. Months. And by the time it announces itself clearly, missed deadlines, a sudden resignation, a health scare, most of the window for doing something about it has already closed.
Deloitte's workplace burnout survey found 77% of respondents reported experiencing burnout at their current job, and more than half report it happening more than once. That repetition matters. It suggests burnout is rarely a single, sudden event. It is a pattern, one that was visible earlier than anyone acted on it, if anyone was looking in the right place.
The signals nobody is trained to see
A 2025 review published in Frontiers in Public Health, synthesising 45 studies on burnout recognition, found that early warning signs cluster into three distinct areas.
The first is intrapersonal, what is happening inside a person before it shows up anywhere else. Persistent fatigue that does not resolve with a weekend off. Difficulty concentrating on tasks that used to be straightforward. Poor sleep. Physical complaints with no obvious cause. None of this looks dramatic. It looks like someone having an off few weeks.
The second is interpersonal, changes in how someone shows up with colleagues. A drop in empathy. Increased irritability. A kind of emotional distancing from people and work that used to matter to them. This is often the first sign colleagues notice, someone seems different, and move on.
The third is occupational, and this is the one most performance management systems are actually built to catch, absenteeism, lateness, a decline in output. The trouble is, this is also the last domain to show up, not the first. By the time burnout reaches the occupational stage, the intrapersonal and interpersonal stages have often been present for weeks or months already.
Why overcommitment hides the problem
One of the more counterintuitive findings in the research is that burnout does not always announce itself through declining performance. Sometimes it shows up as the opposite, unhealthy overcommitment despite apparent productivity. Someone taking on more, working longer hours, appearing more dedicated than ever, while the intrapersonal and interpersonal signs quietly accumulate underneath.
This is why burnout is easy to miss in the people organisations most want to protect. A team member who is still hitting targets does not trigger concern. The system reads output as evidence of wellbeing, when output can easily be evidence of someone running on reserves they do not have.
What this means for leaders
None of the early signals in the research require a clinical background to notice. They require attention, and a willingness to treat subtle changes as worth checking in on rather than waiting for something more obvious.
That might mean noticing when someone who used to contribute easily in meetings has gone quiet, not confrontationally, just less present than before. It might mean noticing a colleague who has started working later and later, and treating that as a conversation starter rather than a sign of commitment worth praising. It might mean simply asking how someone is doing, and paying attention to the answer, rather than the reflexive "fine" that so often closes the conversation before it starts.
Burnout that is caught in the intrapersonal or interpersonal stage is a very different problem to burnout that has reached the occupational stage. The earlier one is a conversation. The later one is often a resignation, a leave of absence, or a mistake that did not need to happen.
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References
Deloitte, Workplace Burnout Survey (over 1,000 professionals), on burnout prevalence and recurrence
Karakolias, S. (2025), "Seeing burnout coming: early signs and recognition strategies in health professionals," Frontiers in Public Health, a review synthesising 45 studies published 2010 to 2025, introducing the three domain framework (intrapersonal, interpersonal, occupational)
