Why employee mental health deserves the same diligence as health & safety

For decades, UK employers have treated physical health and safety as non-negotiable. Risk assessments, protective equipment, incident reporting, mandatory training: the infrastructure is so embedded that workplace injuries are now rare in most sectors, and when they do happen, they’re investigated, recorded and used to learn from and prevent recurrence. In contrast, employee mental health hasn’t yet received the same treatment.

Checks aren’t carried out to determine whether a manager has the skills to spot burnout. There’s no mandatory reporting process for a “near miss” when an employee is one bad week away from a breakdown. Yet the financial and human cost of poor mental health at work now equals, and in many cases exceeds, the cost of physical ill health.

Employee mental ill health is now the leading cause of long-term absence in UK workplaces, and a major driver of short-term absence too. Average sickness absence has climbed to 9.4 days per employee per year, the highest level in over 15 years. Presenteeism (employees showing up to work but not really present or focused due to sickness), is estimated to cost UK employers two to three times more than sickness absence itself, with poor mental wellbeing costing the UK economy as much as £51 billion a year.

If we wouldn’t accept those figures for physical injuries, why do we accept them for mental health? The good news is that the same principles that drove down workplace injuries – vigilance, risk awareness, prevention and early intervention – can be applied to mental wellbeing too, here’s how:

1. Go beyond policy and build a culture of vigilance

Health and safety works because everyone is trained to notice hazards. Mental wellbeing needs the same distributed responsibility. That starts with line managers, who research consistently shows have an outsized influence on how employees experience their working life. One UK study found that nearly seven in ten employees say their manager affects their mental health as much as their partner does, more than their GP or therapist.

Yet most managers aren’t equipped for that responsibility. CIPD research found that only 29% of organisations train line managers in mental health, even though the majority of those who do report their managers feel confident having sensitive conversations and signposting support. If organisations want to be serious about parity with physical safety, mental health first aid training, manager coaching on supportive conversations, and clear escalation routes shouldn’t be a nice-to-have extra. Instead, they should become the standard.

2. Treat absence and leave data as an early warning system

In health and safety, a pattern of near-misses is treated as a leading indicator of a serious incident waiting to happen. The same logic applies to absence and leave data, but only if it’s actually being recorded and reviewed.

Patterns to look for include:

Rising short-term, unplanned absence, particularly frequent one or two-day absences, which is often a stronger predictor of underlying strain than a single long absence.
Reduced annual leave usage. Employees who consistently fail to take their full leave entitlement, or who book leave but cancel it, are often signalling that they don’t feel able to switch off, a potential precursor to burnout.
Leave taken in isolation, with no real rest. “Staycation” leave where someone is still reachable, or leave clustered around deadlines rather than genuine downtime, can be a sign of presenteeism bleeding into personal time.
Lateness or irregular working patterns that represent a change from someone’s normal behaviour.
A spike in sick leave specifically logged as stress, anxiety or ‘unspecified’, which HR should treat as a flag for a wellbeing check-in rather than just a return-to-work form.

None of these signals are useful in isolation or after the fact. They need to be tracked consistently, across teams, so that HR and line managers can spot a deteriorating trend early, in the same way a safety team would investigate a rise in near-misses before it becomes a serious incident.

This is where having a reliable, centralised system for recording absence and leave pays for itself, by spotting trends and patterns over time and using them to take action and make informed decisions.

3. Recognise the signs before they become a crisis

Beyond the data, there are observable behavioural signs that something may be wrong. Training managers to recognise these, much like they’re trained to spot physical hazards, is a core part of early intervention:

Withdrawal from colleagues, meetings, or informal social contact
Noticeable drop in quality or pace of work without explanation
Increased irritability, defensiveness, or uncharacteristic conflict
Persistent tiredness, or visible signs of poor sleep
Presenteeism: being physically present but visibly disengaged, distracted, or struggling to concentrate
Working unusually long hours even when not asked to, or being unable to switch off

Roughly half of UK workers report having worked despite not feeling well enough to do their job properly, which means presenteeism is likely happening on every team, whether or not it’s visible. Encouraging managers to ask open, non-judgemental questions when they notice a change, rather than waiting for a formal absence, is the workplace equivalent of stopping someone before they have an accident rather than filling in an incident report afterwards.

4. Match support to life stage, not a one-size-fits-all

Physical health and safety measures are tailored to the actual risks of a role – for example, a warehouse worker gets different PPE to an office worker. Employee mental health support should be similarly tailored to where someone is in their stage of life, because the pressures people face change significantly over a career.

Early career employees are more likely to report anxiety and burnout, often linked to job insecurity, financial pressure and the steep learning curve of a new role.
Employees with young families are juggling caring responsibilities, sleep deprivation, and the mental load of managing a household alongside work, and research shows parental concern about children’s wellbeing materially affects performance at work.
Employees going through menopause may experience symptoms that affect concentration, mood and confidence, often without adequate workplace support or understanding.
Carers of elderly or unwell relatives face unpredictable demands that don’t fit neatly into standard leave categories.
Long-serving or older employees may be dealing with burnout from accumulated, unaddressed stress, or anxiety about job security amid organisational change.

A genuinely effective benefits package, EAPs, flexible working, mental health days, financial wellbeing support, menopause policies, carer’s leave, reflects this range rather than offering a single generic wellness perk. It’s worth periodically asking whether your current offering matches where your actual workforce sits in terms of life stage, rather than assuming a single benefit serves everyone.

5. Make psychological safety a leadership standard

Physical safety improved fastest when senior leaders visibly modelled it, wearing the hard hat themselves, not just mandating it for others. The same applies to employee mental health. When senior leaders talk openly about workload, stress, or their own experiences of needing support, it gives everyone else permission to do the same.

This matters because trust is still the biggest barrier. Only around half of UK employees feel comfortable talking to their manager about mental health, and employees frequently conceal the real reason for mental health-related absence, recording it as something else entirely. No amount of policy will fix that if the underlying culture still treats employee mental health as something to hide.

A preventative approach is cheaper than the alternative

Investment in mental health pays for itself. Recent estimates suggest a positive return of around £5 for every £1 spent on workplace mental health interventions. Replacing an employee lost to ill health, by contrast, costs employers more than £11,000 once recruitment and onboarding are factored in.

Treating employee mental health with the same seriousness as physical safety is about applying the same proven logic – track the data, train the people on the front line to notice the signs, intervene early, and build a culture where raising a concern is normal rather than risky.

For HR leaders, that starts with the basics. Making sure absence and leave data isn’t just collected but actually reviewed, trended and acted on. Organisations that succeed with this will be the ones that treat absence data as an early warning system – using it to encourage more honest, open and supportive conversations between line managers and employees, with the right training and education at the heart of it.