Last Updated: 21 October 2026
The winter vomiting bug is back in the headlines this week, with NHS hospitals asking unwell visitors to stay away and at least one hospital ward closed after a spike in cases. The illness arrives suddenly, spreads through households, schools and workplaces at remarkable speed, and can leave otherwise healthy adults feeling completely wiped out for a couple of days.
This guide explains what the winter vomiting bug actually is, how to recognise its symptoms, and how long they usually last. It also covers the latest UK surveillance picture for October 2026, how to treat the illness safely at home, why soap matters more than hand gel, and the simple 48-hour rule that protects colleagues, classmates and vulnerable relatives. It is general information only, not medical advice.
What is the winter vomiting bug? The winter vomiting bug is norovirus, a highly contagious stomach bug that causes sudden vomiting and diarrhoea. It spreads easily in schools, hospitals and care homes, usually strikes between 12 and 48 hours after infection, and most people recover within one to three days with rest and fluids.
What Is the Winter Vomiting Bug?
The winter vomiting bug is the everyday name for norovirus, a virus that infects the stomach and intestines and causes sudden sickness and diarrhoea.
Despite its seasonal nickname, norovirus can circulate all year round. Cases tend to climb as the weather turns colder and people spend more time indoors together, which is why the winter vomiting bug has become a familiar part of the colder months in the UK.
The virus is extremely contagious and needs only a tiny number of particles to make someone ill. An infected person sheds the virus in their vomit and stools, and it can survive on surfaces such as door handles, taps and worktops for days if they are not cleaned properly.
Norovirus affects people of all ages, from nursery children to grandparents. Most healthy adults recover fully without treatment, but the illness is taken seriously in hospitals and care homes because it can spread through a ward within hours and hit frail patients much harder.
Outbreaks also close businesses, cancel operations and empty classrooms. A single unwell food handler, carer or schoolchild can pass the virus to dozens of people, which is why official advice focuses so heavily on staying away from others while you are ill and just afterwards.
Because the virus is so hardy, it does not behave like a common cold that fades quickly in fresh air. It can linger in a bathroom or kitchen long after the ill person has recovered, waiting for the next hand to touch a tap, a light switch or a shared towel.
Symptoms and How Long They Last
The winter vomiting bug usually announces itself with little warning. Symptoms typically begin 12 to 48 hours after infection, and many people say they felt fine in the morning and dreadful by the afternoon.
The sickness often comes first, sometimes violently, followed by watery diarrhoea. Alongside those two main symptoms, many people also experience a cluster of other miserable but short-lived effects.
- Feeling sick — waves of nausea that can arrive suddenly, often before any vomiting starts.
- Vomiting — repeated sickness that can strike without much warning, particularly in the first 24 hours.
- Watery diarrhoea — loose, watery stools that may continue after the vomiting eases.
- High temperature — a feverish, shivery feeling, although not everyone develops a temperature.
- Headache and aching limbs — a heavy head and sore muscles, partly caused by dehydration and broken sleep.
- Tummy pain — cramping pains or tenderness in the stomach area as the gut becomes inflamed.
For most people, the worst is over within one to three days, and around two days is typical. You may still feel washed out, off your food and short of energy for a little longer while your body replaces the fluids and salts it has lost.
Children can become unwell very quickly and dehydrate faster than adults, so parents should watch them closely. Older people and anyone with a weakened immune system also need extra care, because what looks like a routine stomach bug can become more serious for them.
Not everyone in a household falls ill at exactly the same time, which can be confusing. Because the incubation period stretches up to 48 hours, a partner or child may seem to have escaped, only to develop symptoms a day or two after the first person in the house.
The Latest UK Picture This October
The newest official surveillance suggests the season is starting quietly, even if individual hospitals are feeling the pressure. The UK Health Security Agency’s weekly winter surveillance for weeks 40 and 41, covering 28 September to 11 October 2026, found norovirus activity within the levels expected for the time of year.
Laboratory reports of norovirus were 18.6% lower than the five-season average for the same period. That is a reassuring start compared with some recent winters, although health officials stress that activity can change quickly once schools return after half term and the weather turns properly cold.
Where samples were characterised, most belonged to genogroup GII, the group responsible for the majority of human infections. Within that group, genotype GII.4 was the most frequent, accounting for 24.6% of characterised samples, and scientists continue to monitor the data for any new variant that spreads more easily.
The national picture has not stopped local disruption. Around 20 October 2026, NHS hospitals issued “please do not visit” warnings to keep the virus out of wards, including a video message from North Tees and Hartlepool NHS Foundation Trust, while a ward at West Suffolk Hospital was closed after a spike in cases.
Those local closures show why the winter vomiting bug matters even in a relatively quiet season. One visitor arriving with symptoms can seed an outbreak that closes beds, delays discharges and leaves already stretched wards shorter of staff, because sick nurses and doctors must stay at home too.
How Norovirus Spreads — and Why It Is Not Flu
Norovirus spreads mainly through contact with an infected person, contaminated food or water, and surfaces carrying the virus. Touching a contaminated door handle and then your mouth can be enough, as can eating food prepared by someone who is ill or recently recovered.
Vomiting itself helps the virus travel. When someone is sick, tiny particles can settle on nearby surfaces and objects, which is why outbreaks in shared spaces such as cruise ships, classrooms, offices and hospital wards are so hard to contain once they begin.
It is also worth separating this illness from influenza, because the two are often confused in winter conversations. Flu is a respiratory illness that attacks the nose, throat and lungs, bringing coughs, congestion and a high fever, whereas norovirus attacks the gut — our guide to flu symptoms 2026 explains the respiratory signs in more detail.
That difference matters for treatment and prevention. A flu jab will not protect you against a stomach bug, antibiotics do not work on either virus, and the winter vomiting bug demands a particular cleaning routine because the virus is tougher on surfaces than many people realise.
You are most infectious while you have symptoms, but you can keep passing the virus on for at least 48 hours after they stop. That hidden tail of infection is the reason behind the strict staying-home rule covered later in this article.
Food can also carry the virus when it is handled after being grown or harvested in contaminated water, or when it is prepared on a contaminated work surface. Thorough cooking helps, but the safest protection remains keeping anyone who is ill, or recently ill, out of the kitchen entirely.
Treating the Illness at Home
There is no specific cure for norovirus, and it cannot be treated with antibiotics because it is a virus, not a bacterial infection. As the NHS norovirus advice explains, treatment is about resting, replacing lost fluids and letting your immune system clear the infection, which it usually does within a few days.
- Rest as much as you can. Cancel plans, stay in bed or on the sofa, and keep a bowl and water within reach.
- Sip fluids little and often. Water is best; small, frequent sips are easier to keep down than large drinks, and oral rehydration sachets from a pharmacy can help replace lost salts.
- Eat when you feel able. Start with plain, gentle foods such as toast, rice, soup or bananas, and avoid rich, fatty or spicy meals until your stomach settles.
- Take paracetamol if needed. It can ease a temperature, headache and tummy pain; always follow the dose on the packet and check with a pharmacist if you are unsure.
- Keep children drinking. Offer babies and children their usual milk feeds and small drinks regularly, and watch for fewer wet nappies or unusual drowsiness.
Dehydration is the main risk with the winter vomiting bug, particularly for young children, older people and anyone whose immune system is weakened. Warning signs include feeling thirsty and dizzy, a dry mouth, dark yellow urine, passing little urine, and, in children, sunken eyes or no tears when crying.
Call NHS 111 or speak to a GP if symptoms persist beyond two to three days, if you cannot keep fluids down, or if you are worried about a baby, an older relative or someone who is immunocompromised. Trust your instincts: the winter vomiting bug should be improving after a couple of days, not getting steadily worse.
As your appetite returns, build back up gradually with balanced meals rather than skipping food altogether. Repeated bouts of illness and several days of barely eating can leave you run down, and our guide to iron deficiency symptoms explains the tiredness and paleness that are worth discussing with a GP if they linger.
Staying Home, Hygiene and the 48-Hour Rule
The single most effective step is also the simplest: stay at home. The NHS advises staying off work, school or nursery until 48 hours after your symptoms have completely stopped, because you remain infectious during that window even though you feel better.
During that time, do not prepare food for other people, and avoid visiting hospitals and care homes altogether. If someone in your household works with food, cares for patients or looks after young children, employers usually apply the same 48-hour rule before they return.
Schools and nurseries apply the same thinking, and parents should expect a child to be sent home and kept away for the full two days after the last episode. It can feel inconvenient when a child seems bright again, but returning too early is one of the commonest ways outbreaks restart.
Hand hygiene needs care, because alcohol-based hand gels do not kill norovirus. Wash your hands thoroughly with soap and warm water, especially after using the toilet, after cleaning up sickness, and before eating or preparing food, and encourage children to do the same.
At home, clean contaminated surfaces with a bleach-based household cleaner, following the instructions on the bottle. Wash soiled bedding and clothing on a hot wash, clean the toilet seat, flush handle, taps and door handles, and do not share towels, flannels or cutlery until everything is washed.
If you are sick, try to stay in one room where possible and clean the bathroom after each use. The winter vomiting bug spreads so efficiently that these unglamorous steps, done consistently for a few days, are what actually break the chain of infection in a household.
What is the winter vomiting bug?
The winter vomiting bug is norovirus, a highly contagious stomach bug that causes sudden vomiting and watery diarrhoea. It spreads easily through contact with infected people, contaminated food and surfaces, and is most common in winter, when people spend more time together indoors.
How long does the winter vomiting bug last?
Symptoms usually start 12 to 48 hours after infection and last between one and three days, with around two days being typical for most healthy adults. You may feel tired and off your food for a little longer afterwards while your body replaces the fluids and salts it has lost.
What are the main symptoms of norovirus?
The main symptoms are feeling sick, vomiting and watery diarrhoea. Many people also develop a high temperature, a headache, tummy pain and aching limbs. Symptoms often arrive suddenly and with little warning, and children, older people and anyone with a weakened immune system should be watched closely for signs of dehydration.
Does alcohol hand gel kill norovirus?
No. Alcohol-based hand gels do not kill norovirus, so they are not a reliable defence against the winter vomiting bug. Wash your hands thoroughly with soap and warm water instead, especially after using the toilet, after cleaning up sickness, and before eating or preparing food for anyone.
When can I go back to work, school or nursery after norovirus?
Stay off work, school or nursery until 48 hours after your symptoms have completely stopped, because you can still pass the virus on during that time. Do not prepare food for other people while you are ill or in that 48-hour window, and avoid visiting hospitals and care homes.
When should I call NHS 111 or see a GP about norovirus?
Call NHS 111 or speak to a GP if symptoms persist beyond two to three days, if you cannot keep fluids down, or if you notice signs of dehydration such as dark urine, dizziness or a dry mouth. Seek advice sooner for babies, young children, older people and anyone who is immunocompromised.
Conclusion
The winter vomiting bug is unpleasant, fast-moving and, for most healthy people, mercifully brief. Norovirus usually strikes within 12 to 48 hours of infection, causes sudden vomiting and watery diarrhoea alongside a temperature, headache and aching limbs, and clears within one to three days for the majority of people.
The latest UKHSA figures show activity within expected levels and laboratory reports running below the five-season average, which is welcome news. Even so, October’s hospital visitor warnings and ward closure are a reminder that a quiet national picture can still mean real disruption locally, especially for frail patients and busy wards.
Your best response is straightforward: rest, sip fluids, and stay at home until 48 hours after your symptoms stop. Wash hands with soap and warm water rather than relying on gel, clean surfaces with a bleach-based product, and keep away from hospitals, care homes and other people’s kitchens while you recover.
If symptoms drag on beyond two to three days, fluids will not stay down, or the person affected is very young, older or immunocompromised, call NHS 111 or your GP for advice. Share this guide with family and colleagues before the season peaks — a household that knows the 48-hour rule is far less likely to pass the bug around twice.
