Not all stress is created equal. The distinction between eustress — the productive tension that sharpens performance — and distress, the kind that erodes health and function, is one of the most important things a leader can understand.
Defining Stress
Lazarus and Folkman (1984) defined stress as “a particular relationship between the person and the environment that is appraised by the person as taxing or exceeding his or her resources and endangering his or her well-being.” That definition is worth sitting with. Stress is not simply pressure, or workload, or difficulty. It is the point at which the demands placed on a person begin to exceed their perceived capacity to meet them.
This distinction matters enormously in a workplace context, because not all stress is harmful. Psychologists distinguish between eustress — the kind of productive tension that sharpens focus, motivates action, and drives performance — and distress, the kind that erodes health, impairs judgement, and, over time, causes serious clinical harm.
The Performance Curve
The Yerkes-Dodson law, developed over a century ago and repeatedly validated since, describes an inverted U-shaped relationship between arousal and performance. Too little stimulation and performance is low; too much and it collapses. There is an optimal zone — a level of pressure that produces peak performance. The challenge for individuals and organisations is identifying where that zone is, and recognising when someone has moved beyond it.
For high-performing professionals — lawyers, executives, doctors, financiers — the cultural pressure is almost always to push further up the curve, to treat discomfort as a sign of insufficient effort rather than a signal that something is wrong. This cultural norm is one of the primary reasons that burnout, depression, and anxiety are disproportionately prevalent in high-achieving professional environments.
When Stress Becomes a Clinical Concern
The transition from productive pressure to harmful distress is rarely sudden. It tends to accumulate over months or years, with the individual adapting their behaviour to manage the load: sleeping less, exercising less, drinking more, withdrawing from relationships, losing the capacity for enjoyment. By the time the clinical threshold is crossed — when the symptoms meet the criteria for burnout, anxiety disorder, or depression — the person has often been in difficulty for a long time.
The clinical markers to watch for include persistent sleep disturbance, significant changes in appetite or weight, difficulty concentrating or making decisions, emotional blunting or irritability, physical symptoms without organic cause (headaches, gastrointestinal problems, chest tightness), and a loss of the sense of meaning or purpose that previously sustained the person’s work.
None of these symptoms in isolation necessarily indicates a clinical disorder. But a cluster of them, persisting over weeks rather than days, is a signal that warrants professional assessment.
The Role of the Organisation
Individual resilience is important, but it is not the whole answer. An organisation that consistently places its people in conditions of chronic overload — regardless of how well-resourced those individuals are — will produce burnout. The Health and Safety Executive’s Management Standards for work-related stress identify six key areas of organisational risk: demands, control, support, relationships, role, and change. Addressing these requires organisational change, not just individual coping strategies.
The most effective corporate wellbeing programmes operate at both levels: building individual capacity through access to clinical support, coaching, and psychological resources, while simultaneously addressing the organisational conditions that create risk.
When to Seek Clinical Support
If you are a manager concerned about a member of your team, or an individual who recognises these patterns in yourself, the threshold for seeking clinical support should be lower than most people assume. A psychiatric or psychological assessment does not commit anyone to a particular course of treatment. It provides clarity: a professional view of what is happening, what the options are, and what the most appropriate next step might be.
At Cardinal Clinic, our assessment process is designed to be exactly that — a conversation with a consultant, not a commitment. It is the starting point, not the destination.