Leisure Sickness: Why Do I Get Ill on Holiday?
You have made it through a busy few months and finally have time to rest. Then, instead of feeling refreshed, you wake up with a headache, sore throat or overwhelming tiredness.
Getting ill as soon as a holiday or weekend begins can feel like incredibly bad timing. However, the pattern is familiar enough to have been given a name: leisure sickness.
Leisure sickness is not an official medical diagnosis, but the term is used to describe people experiencing symptoms when they move from a demanding period into downtime.
So, why can stopping make you feel worse, and is there anything you can do to prevent your next holiday from beginning with a crash?
What Is Leisure Sickness?
Leisure sickness describes symptoms that appear during weekends, holidays or other periods of rest.
The term was introduced by researchers who investigated why some people regularly felt unwell during their time off. Their original study into the prevalence and symptoms of leisure sickness identified commonly reported experiences including:
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Headaches or migraines
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Fatigue and exhaustion
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Muscle aches
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Nausea or digestive discomfort
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Difficulty sleeping
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Cold or flu-like symptoms
Some people experience the pattern regularly, while others only notice it after a particularly stressful period.
The symptoms are real, but “leisure sickness” does not describe one specific illness. It is a way of referring to the timing of the symptoms rather than their medical cause.
Why Do I Get Sick When I Finally Relax?
There is no single proven explanation for leisure sickness. However, several factors may contribute.
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You Were Already Becoming Ill
The holiday may not have caused your symptoms.
During a busy week, deadlines and responsibilities can take up most of your attention. You might notice that you feel slightly tired, tense or run down but continue with your normal routine.
Once work stops, there are fewer distractions and those symptoms can become more noticeable. A cold or infection may also have been developing before the holiday began.
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You Have Been Running On Stress
The autonomic nervous system regulates many of the processes that happen without conscious effort, including heart rate, breathing and digestion.
One part of this system, the sympathetic nervous system, supports the body during periods of pressure. It increases alertness and helps us respond to immediate demands.
This response is useful in the short term. However, regularly working late, sleeping poorly and ignoring the need for rest can leave the body with little opportunity to recover.
When the period of pressure ends, accumulated tiredness may finally catch up with you. Research has also identified a similar “let-down” pattern among people with migraines, with a reduction in perceived stress associated with migraine onset the following day.
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Your Routine Changes Suddenly
The beginning of a holiday often involves more than simply stopping work.
You might stay up late to pack, wake early for a flight, skip breakfast, drink more caffeine and spend hours travelling. Once you arrive, changes to meals, sleep, alcohol intake, temperature and activity levels can place additional demands on the body.
These changes may contribute to headaches, fatigue and digestive discomfort, particularly when you were already tired before travelling.
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You Are Still Mentally At Work
Being away from your desk does not necessarily mean you have switched off.
Checking emails, thinking about unfinished tasks and worrying about the work waiting for you can keep the brain anticipating the next demand.
The recently published Always-On Workforce Report 2026 found that 92% of UK workers struggle to switch off mentally during time off. It also found that 91% have continued working while feeling ill, while 93% work outside their normal hours.
Separate UK research into the unused holiday and burnout epidemic found that 57% of employees work during annual leave.
Is Leisure Sickness The Same As Burnout?
Leisure sickness and burnout are not the same.
Burnout is associated with prolonged workplace stress and can involve emotional exhaustion, reduced motivation and feeling less effective at work.
Leisure sickness refers specifically to symptoms that appear during periods of rest.
However, the two experiences can overlap. Someone who has been under prolonged pressure may be more likely to begin a holiday feeling physically and mentally depleted.
Why Can Stress Affect Digestion?
The digestive system and brain constantly communicate through what is known as the gut-brain axis.
This communication involves the nervous system, hormones and immune system. The vagus nerve is one of the major pathways carrying signals between the brain and internal organs involved in digestion.
Stress can influence how quickly food moves through the digestive system and how sensitive the gut feels. Travel can then introduce different food, meal times, sleep patterns and hydration levels.
This may explain why some people experience bloating, nausea or changes in bowel habits at the beginning of a holiday.
How Can I Avoid Getting Ill At The Start Of A Holiday?
There is no guaranteed way to prevent illness. However, avoiding an abrupt transition from extreme pressure into rest may make the beginning of a holiday easier.
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Start Preparing Before Your Final Day
Try to spread handovers and important tasks across the final week rather than leaving everything until the last day.
If possible, keep the evening before travelling free from work and unnecessary plans.
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Protect Your Sleep
Avoid relying on the holiday to catch up on several nights of poor sleep.
Prioritising sleep before travelling may help you begin the break with more energy and make early flights or changes to routine easier to manage.
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Pay Attention To Early Symptoms
Do not ignore a headache, sore throat or unusual tiredness simply because annual leave is approaching.
Early symptoms may indicate that you need rest or that an illness is already developing.
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Create A Buffer
Where possible, leave some time between finishing work and travelling.
This does not need to be a full day. A quiet evening, short walk or meal away from a screen can help create a clearer boundary between work and the beginning of your break.
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Keep Your First Day Flexible
Avoid placing pressure on yourself to make every moment of the holiday productive.
A lighter first day provides time to recover from the journey, hydrate, eat and adjust to a different routine.
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Fully Disconnect From Work
Turn off notifications and remove work applications from your home screen. Make sure colleagues know who to contact if something genuinely urgent happens.
Reducing the temptation to check messages can make it easier to be mentally present during the break.
How Can Nervous System Regulation Support Recovery?
Nervous system regulation refers to the body’s ability to move appropriately between periods of activation and recovery.
The sympathetic nervous system supports alertness and action. The parasympathetic nervous system supports rest, digestion and recovery.
The aim is not to remain relaxed at all times. Both states are necessary. What matters is the ability to return towards balance after the stressful situation has passed.
Supporting this flexibility should not be limited to annual leave. Regular sleep, exercise, breathing practices, time away from screens and clear boundaries around work can all create more opportunities for recovery.
The Role Of The Vagus Nerve
The vagus nerve is a central part of the parasympathetic nervous system and helps regulate communication between the brain and organs, including the heart and digestive system.
Non-invasive vagus nerve stimulation is an emerging approach to supporting nervous system regulation.
Nurosym uses an earpiece to deliver gentle electrical impulses to the auricular branch of the vagus nerve. The technology has been investigated across more than 60 clinical studies, including research into stress, fatigue and sleep.
Nurosym has not been clinically tested as a treatment for leisure sickness or as a way to prevent infections. Instead, it is designed to support nervous system regulation as part of a regular routine.
When Should I Speak To A Doctor?
Do not assume that symptoms experienced during a holiday are caused by stress.
Headaches, fatigue, nausea and cold-like symptoms can have many causes, including infection, dehydration, heat and changes in food or sleep.
Seek medical advice if your symptoms are severe, persistent or unusual, or if you are concerned about your health.
Making Recovery Part Of Everyday Life
A holiday should not be the first opportunity your body has had to slow down in months.
If you regularly become ill or exhausted when time off begins, it may be worth looking at how much recovery is built into your normal routine.
Small, consistent periods of rest may help make the transition into a holiday feel less extreme. Instead of using the first few days to recover from the weeks before, you can arrive with more energy to enjoy the break itself.