Common Illnesses You Can Catch on a Cruise (and How to Avoid Them)

There's something about being on a cruise ship that makes you feel like you're in your own little world — buffets around every corner, new faces at every meal, elevators packed with fellow passengers heading to the pool deck. It's part of the fun. But that same closeness is exactly why illnesses tend to do the rounds more easily at sea than they would back home. 

Recent reports of norovirus outbreaks aboard cruise ships have once again brought attention to the importance of staying healthy while travelling. 

While norovirus is often the illness that makes headlines due to its highly contagious nature, it isn't the only health concern travellers may encounter during a cruise. Respiratory viruses such as influenza and COVID-19, foodborne illnesses, and even infections picked up during shore excursions can occasionally affect passengers as well. 

Most people sail away with nothing more than a tan and a few good stories. Still, knowing what to watch out for, and a few simple habits to pick up before you board, can make the difference between a trip you'll rave about and one spent in your cabin.

Why illnesses spread more easily on cruise ships

Think about how many surfaces you touch on a night out — a few door handles, maybe a shared table. Now multiply that by a week, and add a few thousand extra hands. That's basically life on a cruise ship.

It's not that cruise ships are unhygienic — most are cleaned far more rigorously than the average hotel. It's simply a numbers game: a lot of people, in a fairly enclosed space, touching a lot of the same things.

A few everyday parts of the cruise experience make it easier for germs to hop from one person to the next:

• Buffets - Shared serving spoons, tongs, and trays get handled by hundreds of people a day, and it only takes one person with unwashed hands to leave germs behind for the next.
• Shared bathrooms - Public restrooms near pools, theatres, and lounges see heavy footfall, which means door handles, taps, and locks are touched constantly.
• Handrails - Staircases and railings along the decks are handled by nearly everyone onboard at some point during the day.
• Elevators - Small, enclosed, and pressed by dozens of fingers an hour — a pretty efficient way for germs to travel between floors.
• Theatre and lounge seating - Armrests and seatbacks get touched by a new set of hands at every show.
• Shore excursions - Stepping off the ship exposes you to new food, water, and environments — and brings you back into contact with everyone else who did the same.
• Close cabin quarters - Cabins are cosy by design, and sharing one with family or a partner means any bug that arrives with one person rarely stays with just them.

Common illnesses you may encounter on a cruise

Most people who go on a cruise come home with nothing worse than a bit of a stomach ache and one too many photos of sunsets. But it helps to know what's actually out there, so you can spot the warning signs early and enjoy the trip without worrying too much. Here's a rundown of the illnesses most commonly linked to cruises. 

1. Norovirus

If you've heard of any cruise illness, it's probably this one — and it's been in the news again recently, with a norovirus outbreak reported aboard the Ruby Princess. 

A recent timeline of outbreaks

To put things in perspective, 2026 has seen a handful of reported norovirus outbreaks so far:

• March – The Star Princess saw over 150 people fall ill.
• April – More than 100 passengers and crew came down with symptoms aboard the Caribbean Princess.
• May – The National Geographic Sea Bird reported a smaller outbreak affecting a dozen or so passengers and crew.
• June – The same ship, National Geographic Sea Bird, saw another round of cases on a separate voyage.
• June–July – The Ruby Princess reported its own outbreak, affecting just over 100 people on a 20-day sailing.
• Norovirus is a highly contagious stomach bug that causes gastroenteritis — inflammation of the stomach and intestines, often just called "gastro" — leading to sudden nausea, vomiting, diarrhoea, and stomach cramps, sometimes alongside a mild fever or body aches. 

Symptoms typically appear within 12 to 48 hours after exposure and may include:

• Nausea
• Vomiting
• Diarrhoea
• Stomach cramps
• Mild fever
• Body aches

It spreads easily through contaminated food or surfaces, or close contact with someone who's infected — which is exactly why it does so well in cruise-ship conditions.

Fortunately, most people recover within 1 to 3 days with rest and adequate hydration. Washing your hands thoroughly with soap and water—especially before eating and after using the bathroom—is one of the most effective ways to reduce your risk. 

2. Influenza and other respiratory viruses

Flu, the common cold, and COVID-19 all spread the same way — through droplets when someone coughs, sneezes, or even just talks nearby. Cruise ships bring people together in theatres, restaurants, and excursion buses, all classic settings for respiratory viruses to pass from person to person. Add in the fact that passengers are often coming from different countries with different circulating strains, and it's easy to see why a cough can travel through a ship within days.

Symptoms vary depending on the virus but may include fever, sore throat, cough, congestion, fatigue, headache, and body aches.

To reduce your risk, consider washing your hands regularly, avoiding close contact with people who are visibly unwell, covering coughs and sneezes, wearing masks, and staying up to date with any recommended vaccinations before travelling.

3. Foodborne illnesses

Not every case of stomach upset during a cruise is caused by norovirus. Foodborne illnesses, commonly referred to as food poisoning, can also occur if food becomes contaminated by harmful bacteria, viruses, or toxins.

Symptoms often include:

• Nausea
• Vomiting
• Diarrhoea
• Stomach cramps
• Fever (in some cases)

Cruise lines follow strict food safety standards, but foodborne illnesses can occasionally be acquired during shore excursions when eating at local restaurants, street vendors, or markets.

Choosing freshly prepared foods, ensuring meals are served hot, and drinking safe water can help reduce your risk.

Read related article: Is It Norovirus or Just Food Poisoning? Key Differences in Symptoms to Note

4. Legionnaires' disease (rare but worth knowing)

Legionnaires' disease is a rare type of pneumonia caused by Legionella bacteria, which can grow in certain water systems if they aren't properly maintained.

Although uncommon, the illness has occasionally been linked to travel settings, including hotels and cruise ships. Potential sources of exposure include water systems that generate fine water droplets, such as showers, spas, and private hot tubs, where Legionella bacteria can multiply if maintenance and water treatment are inadequate.

Symptoms may include fever, cough, shortness of breath, muscle aches, and fatigue. Older adults, smokers, and people with weakened immune systems are generally at higher risk of severe illness.

Fortunately, modern cruise ships operate under strict water management and sanitation protocols to minimise the risk of Legionella growth, making infections among passengers extremely rare

Are hantavirus common on cruise ships?

The short answer is no. Unlike illnesses such as norovirus or influenza, hantavirus is not considered a common health risk on cruise ships.

Hantavirus is primarily spread through contact with the urine, droppings, or saliva of infected rodents, or by breathing in tiny particles contaminated with these materials. It does not spread through casual contact between passengers and is not associated with the shared dining areas, cabins, or recreational facilities found on cruise ships.

For cruise travellers, the risk of hantavirus is generally associated with certain destinations or outdoor activities rather than the voyage itself. For example, people who spend time camping, hiking, staying in remote cabins, or cleaning areas where rodents may be present could have a higher risk of exposure, depending on the region they are visiting.

If your cruise itinerary includes excursions into rural or wilderness areas, it's worth following local health advice and avoiding contact with rodents or areas where rodent droppings may be present. However, for most passengers enjoying a typical cruise holiday, hantavirus remains an extremely rare concern compared with more common travel-related illnesses such as norovirus, influenza, or foodborne infections.

Tips for staying healthy on a cruise

The good news is that most of these illnesses are easy to avoid with a few simple habits — nothing drastic, just a bit of everyday common sense dialled up a notch while you're onboard.

1. Wash your hands with soap, often

This is genuinely the single best thing you can do. Before meals, after using the bathroom, after touching handrails or elevator buttons — make it a habit, not an afterthought.

2. Use hand sanitiser when soap isn't available

It's a good backup, but keep in mind it's less effective against norovirus specifically than a proper handwash.

3. Try not to touch your face

Easier said than done, but most germs make their way in through your eyes, nose, or mouth, especially after touching shared surfaces.

4. Stay hydrated

Sea air, sun, and a full day of activities can dehydrate you faster than you'd expect, and a tired, dehydrated body is more susceptible to picking up illness. There's nothing wrong with enjoying a few cocktails on your cruise — just try to alternate with plain water throughout the day, or an isotonic drink if one's available, to keep yourself properly topped up. 

5. Get enough sleep

Cruises are packed with things to do, but skipping sleep to catch every show and excursion can leave your immune system running on empty.

6. Be mindful at the buffet

Use the serving utensils provided rather than your hands, and avoid utensils that look like they've been sitting out or improperly handled. Pay attention to the food itself too — if something looks like it's been sitting out too long, or smells slightly off, skip it and let a staff member know so they can check on it. And if you're not used to a particular cuisine or ingredient, there's no harm in giving it a miss rather than risking an upset stomach trying something unfamiliar. 

7. Report symptoms early

If you start feeling unwell, tell the ship's medical staff sooner rather than later — quick isolation and treatment protects you and everyone else onboard. Don't brush off warning signs like persistent vomiting, dehydration, bloody diarrhoea, a high fever, difficulty breathing, or symptoms that drag on for several days. These are signs it's time to get checked out rather than waiting it out in your cabin. 

8. Avoid sharing drinks, cutlery, or food 

It sounds obvious, but it's an easy way for illness to jump from one person to the next in a group.

9. Consider a mask in crowded indoor spaces

If you're feeling under the weather, or just want extra peace of mind in packed theatres or elevators, a mask can help reduce the spread of respiratory illnesses.

None of these habits will take away from the fun of your cruise — if anything, they're what let you enjoy it without spending a day (or three) in your cabin.

The takeaway

At the end of the day, cruising remains one of the most enjoyable ways to see the world. Yes, thousands of people sharing buffets, elevators, and lounges does make it a little easier for illnesses to spread — but that's exactly why cruise lines invest so heavily in sanitation, monitoring, and rapid response the moment something's picked up.

The real takeaway is that most of what keeps you healthy at sea comes down to the same habits that keep you healthy anywhere else: wash your hands often, stay hydrated, get enough rest, and listen to your body if something feels off. Pack a few health and safety essentials, be a little more mindful at the buffet, and don't hesitate to speak to the ship's medical team early if symptoms do show up.

Do that, and there's no reason your biggest worry on your next cruise should be anything more than which deck has the best sunset view.

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