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Dr. Chrysoula I. Liakou MD, PhD
- Treated online: Assessment and recovery guidance. Norovirus is recognised from the pattern by video, dehydration is checked, anti-sickness medicine can be prescribed for adults who cannot keep fluids down, and you are directed to in-person care if dehydration develops; no medicine cures the virus.
- What it is: a small, hardy virus that infects the gut lining and sheds in vast numbers in stool and vomit; norovirus causes about 1 in 5 cases of gastroenteritis worldwide, peaks from November to April in Europe, and immunity after infection lasts only months.
- How long: symptoms start 12 to 48 hours after exposure, peak in the first 24 hours and clear within 1 to 3 days; you stay infectious until at least 48 hours after the last episode, and the virus can shed in stool for 2 weeks or more.
- Spread: hands, surfaces, shared food and the droplets from vomiting; as few as 10 to 100 particles infect, the virus survives on surfaces for days, and thorough hand washing with soap and water is what stops it, because alcohol gel is not reliable against norovirus.
- Dehydration: the real danger, above all for babies, older adults, pregnant women and anyone with a weakened immune system; little or dark urine, dizziness, a dry mouth and drowsiness are the signs to act on.
- Emergency: call 112 if someone with norovirus is very drowsy, floppy or hard to wake, confused, or cannot keep any fluid down and has stopped passing urine.
Norovirus usually settles on its own, but dehydration is the real risk.[3] Seek urgent in-person care if you cannot keep any fluids down for a day, pass very little or no urine, are drowsy or confused, or if a baby, older adult, pregnant woman or someone with a weakened immune system is badly affected. Blood in the stool, a high fever, or severe constant abdominal pain point away from norovirus and need assessment. If someone is very drowsy, floppy or hard to wake, call 112.
Can an online doctor treat norovirus?
Not with a cure, because none exists. Norovirus is a self-limiting viral infection that clears on its own within a couple of days, and antibiotics do nothing against it.[1] What an online doctor can do is confirm norovirus is the likely cause, assess your dehydration risk, give clear rehydration and hygiene advice, and flag the point at which symptoms need in-person care.
That honesty is the point. Anyone promising a prescription to "cure" norovirus is selling you something the virus ignores. The useful medicine here is accurate assessment and safety-netting, so you know what to watch for and when to act.
How an online consultation helps with norovirus
- Confirming it is likely norovirus: sudden vomiting and watery diarrhoea over one to three days has a short list of causes, and the doctor helps separate norovirus from food poisoning, other infections and non-infectious causes.
- Judging your dehydration risk: the doctor checks fluid intake, urine output, dizziness and who is affected, because dehydration, not the virus itself, is what turns norovirus dangerous.[2]
- Hygiene and outbreak advice that works: practical steps to stop it spreading through a household, workplace or trip, plus the clear rule on when it is safe to return to normal life.[1]
- A safety net, not false reassurance: exact signs that mean this is no longer routine, and honest onward direction if you or a vulnerable family member need to be seen in person.
What the doctor checks in an online norovirus consultation
The assessment is short and focused, because the decisions that matter are about hydration and about whether this is really norovirus. The doctor will typically establish:
- The timeline: how suddenly it started, how long it has lasted, and the mix of vomiting and diarrhoea, since norovirus tends to arrive abruptly and pass within one to three days.[1]
- Fluids in and out: whether you can keep sips down, how much you are drinking, and your urine amount and colour, the most reliable everyday markers of dehydration.[2]
- Warning features: blood in the stool, a high or persistent fever, severe or constant abdominal pain, or vomiting that will not stop, all of which suggest something other than simple norovirus.
- Who is affected and their risk: babies and young children, older adults, pregnant women, and people with weakened immunity or significant other illness dehydrate faster and are assessed more cautiously.
- Context and spread: recent contact with others who were ill, a known outbreak, travel, or work in healthcare, care homes or food handling, all of which change the advice on returning to normal life.
- Existing conditions and medicines: diabetes, kidney problems, or medicines such as diuretics and some blood-pressure drugs that need care during a dehydrating illness.
What is norovirus, and how does it spread?
Norovirus is the most common cause of viral gastroenteritis worldwide and the classic culprit behind the sudden winter outbreaks that sweep through schools, offices, cruise ships and hospitals.[1] It causes forceful vomiting and watery diarrhoea, often with cramps, nausea and a mild fever, coming on abruptly and usually clearing within one to three days. It spreads with remarkable ease: through tiny amounts of an infected person's vomit or stool, on hands and surfaces, in contaminated food or water, and through the fine spray created when someone is sick.[5] Very few viral particles are needed to infect someone, which is why it races through households and closed settings. Alcohol hand gels are not reliable against it, so thorough handwashing with soap and water matters more here than almost anywhere else.
Norovirus or food poisoning?
The two overlap and are easy to confuse, because both cause vomiting and diarrhoea. The useful distinction is how you caught it. Norovirus is an infection that spreads from person to person and through contaminated surfaces and food, and it travels fast between people. Food poisoning is gastroenteritis you caught specifically from something you ate or drank, whether a virus, bacteria such as salmonella, or a toxin, and it does not usually pass person to person in the same way. For the person who is unwell, the immediate treatment is the same either way: fluids, rest and watching for dehydration. Norovirus is also the leading cause behind the broader picture of gastroenteritis, which is the umbrella term for an inflamed, infected gut.
How long does norovirus last, and when can I go back to work or school?
The illness itself is short: symptoms usually last one to three days, and most people recover fully at home with fluids and rest. The catch is that you remain infectious for a while after you feel better. The standard public-health advice is to stay away from work, school and other people until at least 48 hours after your vomiting and diarrhoea have completely stopped, and to avoid visiting hospitals or care homes during that window because the people there are especially vulnerable.[1][4] If you handle food for a living or work in healthcare, that 48-hour rule is not optional, it is how outbreaks are prevented. Do not prepare food for others during this time, and keep towels and flannels personal until everyone in the house is clear.
Is my norovirus suitable for online care?
For most healthy adults it is, and the exceptions are about dehydration and vulnerability. This is the decision framework the doctors use, aligned with the cited guidance.
Swipe sideways to compare →
| Presentation | Likely first step | Suitable for online care? | When referral or in-person care is needed |
|---|---|---|---|
| Healthy adult, sudden vomiting and diarrhoea, keeping some fluids down | Rehydration, rest, hygiene and return-to-work advice[1] | Yes | Symptoms last beyond a few days, or fluids can no longer be kept down |
| Struggling with fluids, feeling faint, passing little urine | Assessment for dehydration; oral rehydration or in-person care[2] | Assessment, then likely in-person | Signs of moderate or worsening dehydration |
| Baby, older adult, pregnant or immunocompromised person affected | Lower threshold for in-person assessment | Assessment and referral | Usually: these groups dehydrate faster and need closer review |
| Blood in stool, high fever, or severe constant abdominal pain | In-person assessment for another cause | Assessment and referral only | Always: this is not a typical norovirus picture |
| Drowsy, confused, no urine, or a child who is floppy and hard to rouse | Emergency care | No | Call 112 or attend urgently |
Not sure which row is you? A doctor can tell you in one consultation.
See available times →Treatment options for norovirus
What you can do yourself
Recovery is about replacing fluid faster than you lose it. Sip water, diluted squash or a rehydration drink little and often, even when you feel you cannot, because small frequent sips stay down better than large gulps. Oral rehydration salts, sold in pharmacies, are worth using if diarrhoea is heavy or you are older, as they replace salts as well as water.[2] Rest, and let your appetite return in its own time; when it does, start with bland, easy foods rather than forcing a full meal. Most people need nothing more than this. There is no benefit in taking antibiotics, and there is no cure to chase.[1]
What about medication?
Honestly, norovirus rarely calls for any. Because it is viral and short-lived, there is no specific drug that treats it, and antibiotics are useless against it and can make things worse. For some adults an anti-sickness or anti-diarrhoeal medicine may occasionally be considered for short-term symptom relief, but these are not suitable for everyone (anti-diarrhoeals in particular are avoided if there is blood in the stool or a high fever, and are not used in young children), which is exactly the kind of judgement a consultation is for. A prescription is never issued without one. The single most valuable thing an online doctor offers for norovirus is not a medicine at all: it is an accurate read on your dehydration and a clear plan, with a full refund if your doctor decides you need to be seen in person.
When it might be something else
A sudden upset gut has more than one explanation, and part of the consultation is keeping the alternatives in view. Symptoms clearly traced to a specific meal, especially a shared one where others fell ill, lean towards food poisoning. Watery diarrhoea without much vomiting, or diarrhoea that drags on well beyond a few days, is worth reviewing on the diarrhoea page, because persistent diarrhoea has its own causes. Blood in the stool, a swinging fever, or severe localised pain (particularly low on the right side) point away from norovirus entirely and need in-person assessment. And recent travel to certain regions widens the list of possible infections, which is why the doctor asks about it.
When norovirus is treated online, and when you need in-person care
Treated online: otherwise healthy adults with a typical short-lived norovirus picture who are managing some fluids, where the consultation confirms the likely diagnosis, assesses hydration, and provides rehydration, hygiene and return-to-work guidance. Norovirus sits within the wider group of stomach and digestive problems the doctors assess online.
In-person care: anyone who cannot keep fluids down or shows signs of dehydration is directed to in-person care for assessment and, if needed, fluids;[2] babies, older adults, pregnant women and immunocompromised people are assessed with a lower threshold for being seen in person; and blood in the stool, a high fever or severe pain is investigated for another cause rather than assumed to be norovirus. In those cases the consultation gets you to the right care quickly.
When to get in-person care
Call 112 or attend emergency care immediately if you or someone with you is very drowsy, confused or hard to wake, is passing no urine, has severe constant abdominal pain, or (in a child) is floppy, unusually still, or has a sunken appearance. Arrange urgent in-person assessment the same day if you cannot keep any fluids down for 24 hours, are passing very little urine, are vomiting blood, or if a baby, older adult or immunocompromised person is significantly affected. Dehydration is the danger with norovirus, and it is treatable when caught early.
How Mobi Doctor works
- Book a time that suits you: open daily 7am–11pm CET. You can see a doctor over video, usually within 15 minutes. No subscription, exact price up front.
- Speak to a licensed doctor about norovirus: a private video call: you describe what you feel, the doctor asks what matters, and you agree the right plan together.
- Get a clear recovery and hygiene plan: if you need in-person care, the doctor tells you plainly and points you there, or you get a full refund.
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Not sure it’s norovirus? Tick every symptom you have to see each condition page that mentions it. It finds the right page, not a diagnosis: a doctor gives you that on a video call.
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Similar symptoms, different condition? Food Poisoning can start the same way. Compare them, or look up any other symptom in the full symptom checker.
Frequently asked questions about norovirus
What is norovirus, and how do you catch it?
Norovirus is a highly contagious virus that infects the lining of the stomach and intestines and causes sudden vomiting and diarrhoea. You catch it from tiny amounts of stool or vomit from an infected person: on hands, door handles and surfaces, in food handled by someone infected, in shellfish from contaminated water, and from droplets when someone vomits nearby. A few particles are enough, which is why it sweeps through households, schools and hospitals.
What are the symptoms of norovirus?
Norovirus starts abruptly 12 to 48 hours after contact with sudden nausea and vomiting, often projectile, then watery diarrhoea, stomach cramps, aching limbs, headache, chills and sometimes a mild fever. Symptoms are worst in the first day and usually clear within one to three days, leaving tiredness. Blood in the stool, a high fever or severe constant pain are not norovirus and need assessment.
Can an online doctor prescribe something for norovirus in Europe?
There is no specific cure to prescribe, because norovirus is viral and antibiotics do not work against it. After a consultation the doctor may prescribe short-term anti-sickness medicine for an adult who cannot keep fluids down, and advise on pausing medicines such as diuretics while you are losing fluid; the main help is assessing dehydration, confirming the diagnosis and planning safe recovery and isolation.
How long does norovirus last?
Norovirus usually lasts one to three days, with vomiting settling first and diarrhoea a day or so later, and most people feel better within two to three days, though tiredness can linger for a week. Symptoms beyond three days, or vomiting beyond two days, mean the diagnosis is reviewed; diarrhoea beyond a week suggests another cause and is tested.
How long am I contagious with norovirus?
You remain infectious with norovirus until at least 48 hours after your vomiting and diarrhoea have completely stopped, and you can shed the virus in stool for two weeks or longer. Stay away from work, school and others during the 48-hour window, avoid preparing food for anyone, do not visit hospitals or care homes, and keep washing hands carefully for the following fortnight.
Do I need antibiotics for norovirus?
No, antibiotics are not needed for norovirus: they do not work against viruses, can prolong diarrhoea by disturbing gut bacteria, and drive resistance. Norovirus clears on its own, and treatment is fluids, rest and hygiene. Antibiotics are only for proven bacterial infections, which norovirus is not, and loperamide is best avoided unless an adult must travel.
Is it norovirus or food poisoning?
Norovirus is an infection that spreads quickly from person to person and via surfaces and food, usually through a household or workplace over a few days, with vomiting as the leading symptom. Food poisoning is gastroenteritis caught from something you ate, often with several people ill after one meal, and bacterial causes bring more fever and cramps. For the person who is ill, the treatment is the same: fluids, rest and staying home.
How do I know if norovirus is making me dehydrated?
Watch for passing little or no urine, dark urine, dizziness on standing, a dry mouth, headache and tiredness, and in children fewer wet nappies, no tears or unusual drowsiness. Not keeping any fluids down for a day, or drowsiness and confusion, means urgent in-person care. Sipping oral rehydration solution after every episode of vomiting or diarrhoea keeps most adults with norovirus out of hospital.
What should I eat and drink with norovirus?
With norovirus, sip small amounts of oral rehydration solution, water or diluted squash every few minutes rather than drinking a glassful, which comes straight back; once vomiting eases, eat plain starchy food such as toast, crackers, rice, bananas or soup in small amounts. Avoid alcohol, caffeine, fizzy drinks, fruit juice, milk and fatty food for a couple of days, and return to a normal diet as you recover.
How do I clean my home after norovirus?
Clean up vomit and diarrhoea straight away wearing gloves, using paper towels into a sealed bag, then wash the area with detergent and disinfect with a bleach-based cleaner, because norovirus survives ordinary cleaning. Disinfect toilets, flush handles, taps, door handles and light switches daily, wash soiled clothes and bedding separately on a hot wash, keep towels personal, and keep the ill person out of the kitchen.
How can I prevent norovirus?
Prevent norovirus by washing hands thoroughly with soap and water after the toilet, before preparing or eating food and after caring for someone ill, not relying on alcohol gel, cooking shellfish thoroughly, rinsing fruit and vegetables, keeping an ill person away from food and work for 48 hours, and bleach-cleaning shared surfaces during an outbreak. There is no vaccine yet, and immunity after infection fades within months.
Is norovirus dangerous in pregnancy or for older people?
Norovirus does not harm the baby directly, but dehydration in pregnancy can trigger contractions and dizziness, so fluids are replaced carefully and persistent vomiting is reviewed. Older people, especially in care homes, dehydrate fast, show it as confusion or falls, and may need medicines such as diuretics paused; outbreaks in care homes and hospitals are why visitors with norovirus symptoms must stay away for 48 hours.
- Norovirus infection: factsheet, ECDC, European Centre for Disease Prevention and Control, 2024.
- Gastroenteritis: Clinical Knowledge Summary, NICE, National Institute for Health and Care Excellence, 2024.
- Diarrhoeal disease: fact sheet, WHO, World Health Organization, 2024.
- Norovirus: symptoms, causes, prevention and treatments, HSE, Health Service Executive (Ireland), accessed August 2026.
- Food safety fact sheet, WHO, World Health Organization, 2026.
- Norovirus (vomiting bug), NHS, National Health Service (UK), reviewed December 2024.
This page is for information only and is not a substitute for a medical consultation. Guideline links are provided for transparency; treatment decisions are made with your doctor.
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