Workplace fatigue: causes, warning signs and prevention

Most people feel tired from time to time, especially after a busy period at work or a poor night's sleep. But when fatigue becomes persistent, it can affect much more than energy levels. Concentration, decision-making, productivity and overall wellbeing can all suffer, making it harder for employees to perform at their best.

For employers, understanding workplace fatigue is an important part of creating a healthy and supportive working environment. While occasional tiredness is normal, ongoing fatigue shouldn't be dismissed as simply part of modern working life.

In this guide, we'll look at what workplace fatigue is, some of its common causes, the warning signs to look out for and practical ways employers can help support their teams.

What is workplace fatigue?

Workplace fatigue is a state of physical or mental exhaustion that reduces a person's ability to work safely and effectively. It can develop gradually or appear after periods of intense physical or mental effort.

Fatigue is different from simply feeling sleepy. It can affect concentration, memory, motivation and reaction times, making routine tasks feel more difficult than usual.

According to the NHS, tiredness and fatigue are common, but persistent fatigue lasting several weeks can have many possible causes and should be discussed with a healthcare professional if it doesn't improve with rest or lifestyle changes.

Because fatigue is a symptom rather than a condition, it's important not to assume there's a single cause.

What can cause workplace fatigue?

There are many reasons why an employee may experience ongoing fatigue, and often several factors are involved.

High workloads and prolonged stress

Periods of increased demand are common in most organisations. However, consistently heavy workloads, tight deadlines and limited opportunities to recover can leave employees feeling mentally and physically drained.

The CIPD's Health and Wellbeing at Work research consistently identifies excessive workloads and pressure as among the most common causes of work-related stress, highlighting the importance of effective people management and supportive workplace practices.

Poor sleep

Sleep is essential for both physical and cognitive performance. Shift work, long commuting times, caring responsibilities or disrupted sleep patterns can all contribute to fatigue during the working day.

Even losing a small amount of sleep over a prolonged period can affect concentration, reaction times and mood.

Work patterns

Long shifts, extended screen time, repetitive tasks or jobs requiring sustained concentration can all increase mental fatigue. Employees working irregular hours may also find it harder to maintain healthy sleep routines.

Lifestyle factors

Hydration, nutrition and physical activity all play a role in maintaining energy levels. Skipping meals, relying heavily on caffeine or not taking regular breaks can contribute to feelings of fatigue.

Underlying health conditions

Sometimes fatigue may be linked to an underlying health issue. According to the NHS, persistent tiredness can be associated with a wide range of health conditions, including iron deficiency anaemia, thyroid disorders, diabetes, menopause, some medications and mental health conditions.

Employers shouldn't attempt to diagnose these issues, but they should encourage employees experiencing ongoing fatigue to seek appropriate medical advice if symptoms persist.

Recognising the warning signs

Workplace fatigue isn't always obvious. Some employees continue working despite feeling exhausted, making it easy for managers to overlook the early signs.

Changes that may indicate someone is experiencing workplace fatigue include:

• Difficulty concentrating or staying focused
• Reduced productivity or slower completion of tasks
• Increased mistakes or lapses in judgement
• Forgetfulness or difficulty retaining information
• Lower motivation or enthusiasm
• Irritability or changes in mood
• Frequent sickness absence
• Reduced participation in meetings or team discussions

These signs don't necessarily mean someone is experiencing fatigue, but noticeable or ongoing changes in behaviour should prompt a supportive conversation.

Why workplace fatigue matters

Fatigue doesn't only affect individual wellbeing. It can also have a wider impact on organisations.

According to the Health and Safety Executive (HSE), an estimated 964,000 workers experienced work-related stress, depression or anxiety in Great Britain during 2024/25. These conditions accounted for more than half (52%) of all work-related ill health and resulted in 22.1 million working days lost.

Fatigue can also increase the likelihood of errors, reduce creativity and affect collaboration. In safety-critical industries, reduced alertness may increase the risk of workplace incidents, while in office-based roles it can lead to poorer decision-making and lower productivity.

Creating an environment where employees feel able to speak openly about their wellbeing benefits both individuals and organisations.

How employers can help prevent workplace fatigue

While employers can't remove every source of fatigue, there are practical steps that can make a positive difference.

Encourage regular breaks

Short breaks throughout the working day allow employees to recharge and maintain concentration. Managers should lead by example by taking breaks themselves and encouraging others to do the same.

Review workloads regularly

Regularly reviewing priorities can help ensure workloads remain realistic. During particularly busy periods, managers should consider whether deadlines can be adjusted or additional support provided.

Promote healthy working habits

Encouraging employees to take annual leave, stay hydrated and maintain healthy work-life boundaries can support long-term wellbeing. Simple measures, such as discouraging unnecessary out-of-hours emails or ensuring employees take their full lunch break, can also help reduce fatigue over time.

Train managers to recognise changes

Managers are often the first to notice when someone's behaviour or performance changes. Providing them with the confidence to have supportive, confidential conversations can help identify concerns early.

Foster a culture of openness

Employees are more likely to seek support when they know their concerns will be listened to without judgement. Regular wellbeing check-ins and open communication help normalise conversations about health and wellbeing.

Supporting a proactive approach to health

Because workplace fatigue can have many different causes, understanding more about your health can be an important first step.

Bluecrest corporate health assessments provide employees with personalised health insights based on clinically analysed test results. While health assessments don't diagnose the cause of fatigue, they can help employees build a clearer picture of their health and identify areas they may wish to discuss with their GP or another healthcare professional.

Providing access to preventative health support demonstrates a commitment to employee wellbeing and encourages individuals to take an active role in managing their health.

Helping employees feel their best

Supporting employees isn't about expecting people to work through tiredness. It's about recognising when fatigue may be affecting wellbeing, creating opportunities for open conversations and encouraging healthy habits that support long-term performance.

By combining supportive management with a proactive approach to health, employers can help build healthier, more engaged and more resilient teams.

To find out more about Bluecrest's corporate health assessment packages, contact our team on 01903 253177 or enquire online