Mental health has become one of the defining workplace issues of our time. The World Health Organization (2019a) reminds us that poor mental health affects not only individuals but also organisational performance. The numbers are stark: globally, mental ill‑health costs an estimated £800 billion every year and contributes to 12 billion lost workdays (WHO, 2024). For employers, this translates into rising absence, presenteeism, and recruitment challenges (Centre for Mental Health, 2024).

Crucially, many early signs of mental health deterioration appear first at work. Shifts in behaviour, dips in performance, changes in attendance, or subtle signs of strain often surface long before a formal diagnosis is made (Stevenson & Farmer, 2017). Occupational Health (OH) should be in a unique position: close enough to the day‑to‑day realities of work to spot early difficulties, yet independent enough to offer objective guidance.

OH is described as a bridge, linking employees, managers and external clinicians, coordinating early interventions, and supporting psychological wellbeing (Thornbory and Everton, 2017). We know early identification leads to better outcomes (WHO, 2019b) and in OH practice, this often means preventing avoidable sickness absence and supporting people to stay well at work.

When OH gets involved, is it too late?

Despite OH’s preventive remit and co-ordinating interventions, mental health identification often happens reactively. Typically, OH becomes involved only after a manager raises concerns or an employee reaches a crisis point. Tools such as the PHQ‑9 or GAD‑7 (NICE, 2022) are only used once a referral is made, confirming distress rather than preventing escalation.

This contrasts sharply with OH’s approach to physical health, where early functional assessment is routine. For mental health, however, early signs are often normalised or not discussed, especially in high-pressure environments or insecure roles. The result? Opportunities for early intervention are missed, and deterioration continues unchecked.

Why Employees Don’t Seek Help

Even in organisations with supportive OH services, barriers persist. Culture plays a significant role. Many workplaces still reward emotional toughness, and phrases like “man up” remain socially acceptable which can discourage help‑seeking and perpetuate stigma.

Stigma, confidentiality worries, and fear of professional consequences, such as being judged, sidelined or even losing one’s job, continue to deter employees (McGrath et al., 2023; HSE, 2023). Research suggests up to 40% of employees with mental health difficulties avoid support for these reasons.

Access to OH is also inconsistent. Smaller employers may lack provision entirely, and even larger organisations may have limited capacity. These structural barriers reduce the likelihood of early identification, regardless of individual need.

Stress, work and the blurred lines of early symptoms

One of OH’s biggest challenges is distinguishing between normal work‑related stress and emerging mental health deterioration. Stress reactions vary widely between individuals (Piotrowski & Hollar, 2024), and early cognitive changes, such as reduced concentration, impaired decision‑making or memory difficulties, can be mistaken for workload pressure (WHO, 2019a) rather than emerging psychological distress.

Chronic stress, if unrecognised, can lead to physical and psychological harm (Anisman, 2021). OH practitioners know this well: prolonged stress increases vulnerability, especially for individuals with previous adversity or limited social support (Kirkbride et al., 2024). This reinforces the need for personalised, holistic OH assessments rather than one‑size‑fits‑all approaches.

Who else can spot the early signs?

Early identification is not solely an OH responsibility. Organisational culture, leadership behaviour and HR practice all shape whether early signs are noticed or ignored.

Positive cultures that promote psychological safety, honesty and respect are consistently linked to better wellbeing and reduced presenteeism (Wietrak & Gifford, 2024; Hasson & Butler, 2020). Supportive leadership, empathetic, communicative, and styles of interaction can significantly improve mental health outcomes (Hammer et al., 2024).

Policy also matters. Hughes, Cooper and Kinder (2023) argue that mental health approaches must be embedded at organisational level, not left to individuals. The HSE’s Management Standards for Work‑Related Stress provide a practical framework for this, encouraging early risk assessment and proactive action (HSE, n.d.; ILO, 2022).

However, even with these structures, barriers to early identification are not simply individual but are embedded within organisational structures, cultures and resource availability. This is a crucial point for OH practitioners: early identification requires shared responsibility, not just employee disclosure.

The role of OH: Practical, preventive and person‑centred

OH’s strength lies in its ability to offer practical, evidence‑based support. Early adjustments—such as flexible working, hybrid arrangements or modified hours, can help employees manage energy levels, attend therapy, or reduce commuting stress (ACAS, 2021). Management advice, including workload reorganisation or extended deadlines, can reduce overwhelm and support wellbeing (Rugulies et al., 2023).

Workplace stress management programmes (WSMPs) such as mindfulness, CBT‑based approaches and relaxation training can also help (Wirtz et al., 2024). However, they are not a cure‑all. As Rugulies et al. (2023) caution, these interventions risk placing responsibility on the employee rather than addressing organisational causes of stress.

OH recommendations are only effective if employers have the resources and flexibility to implement them. Staffing shortages, budget constraints and rigid processes can limit what is possible (SOM, 2025a; 2025b).

Can OH identify mental health difficulties earlier?

Yes! But only if organisational, cultural and structural barriers are addressed.

Early signs of mental health deterioration are often subtle and easily normalised. Without proactive systems, supportive leadership and accessible OH services, these signs are missed, delaying support and increasing the risk of deterioration (Hesketh & Cooper, 2019).

OH plays a vital preventive role: holistic assessment, early advice, practical adjustments, and liaison with managers. But its effectiveness depends on the environment it operates within. For OH to identify difficulties earlier, organisations must embrace shared responsibility for mental health, invest in accessible OH provision, and create cultures where early help‑seeking is safe and encouraged.