Cruises pack thousands of people into shared dining rooms, pools, and entertainment spaces, which makes them uniquely efficient at spreading illness. The good news: a handful of practical habits dramatically cut your risk. Most of what keeps you healthy on a cruise comes down to hand hygiene, sun protection, hydration, and a little planning before you ever board the ship.
Wash Your Hands, Then Wash Them Again
The single most important thing you can do on a cruise is wash your hands with soap and water, frequently and thoroughly. This matters more than you might think, because the hand sanitizer dispensers stationed around every cruise ship have a significant blind spot: they don’t work well against norovirus, the stomach bug responsible for the vast majority of cruise ship outbreaks. The CDC is clear on this point. Hand sanitizer can supplement handwashing, but it is not a substitute.
Wash before every meal, after using the restroom, after touching railings or elevator buttons, and after returning to your cabin from any public area. A European research study that sampled 18 high-touch surfaces aboard a cruise ship found potentially dangerous bacteria on stair rails, door handles, elevator buttons, restroom doorknobs, and lounge door handles. These pathogens persisted even on surfaces that were regularly cleaned, which means you can’t rely on the ship’s housekeeping crew to eliminate every risk. Your hands are the main vehicle that moves germs from those surfaces to your mouth, nose, and eyes.
Protect Yourself From the Sun at Sea
UV exposure is stronger on a cruise than most people expect. Water reflects ultraviolet radiation back at you, effectively increasing the dose your skin absorbs beyond what you’d get on land. Add the fact that you’re often at tropical latitudes with minimal shade on upper decks, and sunburn becomes one of the most common health problems on any voyage.
Use a broad-spectrum sunscreen with at least SPF 30 and reapply every two to four hours. Reapply more often if you’re sweating or getting in and out of the pool. A wide-brimmed hat and UV-blocking sunglasses help protect areas people tend to forget, like the tops of ears, the scalp along hair parts, and the skin around the eyes. Spending a full day at port walking around a beach town can deliver a worse burn than a day on deck, so don’t reserve sun protection only for pool days.
Handle Seasickness Before It Starts
If you’re prone to motion sickness, or if you’ve never been on a ship and aren’t sure, it’s worth having a plan. Two options dominate: over-the-counter pills and prescription patches.
- Meclizine (Bonine, Dramamine Less Drowsy) is taken once daily and kicks in within 30 to 60 minutes. It’s available without a prescription and works well for mild to moderate seasickness. The main downside is drowsiness, which can take the edge off your first day.
- Scopolamine patches are prescription-only, stick behind your ear, and last three days per patch. They can take up to four hours to reach full effect, so you’ll want to apply one the evening before embarkation. They’re more likely to cause dry mouth and dizziness than meclizine, but many frequent cruisers prefer them for the convenience of not remembering a daily pill.
Both options share a similar side-effect profile: drowsiness, dry mouth, blurred vision, and occasionally constipation. Choosing a midship cabin on a lower deck also helps, since that’s where the ship moves least. Keeping your eyes on the horizon when you feel queasy gives your brain a stable reference point that reduces the mismatch between what you see and what your inner ear feels.
Plan Your Health Before You Board
The CDC recommends seeing a healthcare provider or travel health specialist four to six weeks before departure. That lead time matters because some vaccines need weeks to build full protection. At minimum, make sure you’re current on routine vaccinations, your annual flu shot, and COVID-19 boosters. If you’re eligible for an RSV vaccine, that’s worth discussing too. Respiratory viruses spread efficiently in the close quarters of a cruise ship.
Your itinerary determines whether you need anything extra. A Caribbean cruise with port stops in certain countries may call for hepatitis A, typhoid, or other destination-specific vaccines. Check the CDC’s destination pages for each port on your route, and confirm directly with your cruise line whether they have any health requirements of their own.
Bring a small kit with essentials you’d rather not hunt for at sea: your regular medications in their original pharmacy bottles, a basic pain reliever, anti-diarrheal tablets, adhesive bandages, and motion sickness medication. Ship medical centers carry these items, but at a significant markup.
Check Your Ship’s Sanitation Score
The CDC’s Vessel Sanitation Program inspects cruise ships that dock at U.S. ports and scores them on a 100-point scale. A score of 86 or higher is considered satisfactory. Anything at 85 or below is a failing grade. Inspectors evaluate water quality, food handling, pool and spa maintenance, and general cleanliness throughout the vessel.
You can look up any ship’s most recent score on the CDC’s online inspection search tool before you book. Most major cruise lines consistently score in the high 90s, but checking is a two-minute task that can flag an outlier. If a ship recently failed an inspection, that’s useful information regardless of how good the deal looks.
Stay Hydrated Without Overthinking It
Dehydration sneaks up on cruise passengers. You’re in the sun more than usual, drinking more alcohol than usual, and often not realizing how much you’re sweating in humid tropical air. The combination can leave you with headaches, fatigue, and dizziness that people sometimes mistake for seasickness.
Tap water on modern cruise ships goes through filtration and disinfection systems that are monitored to meet safety standards, and ships calling at U.S. ports must carry out documented risk assessments of their water systems. The water from your cabin tap and the dining room is safe to drink. Carry a refillable water bottle and make a habit of drinking a glass of water between alcoholic drinks. If you’re spending a day at a port in a developing country, stick to bottled or purified water on shore.
Be Smart at the Buffet
Buffets are the highest-risk dining option on any cruise. Food sits at serving temperature for extended periods, dozens of people share the same serving utensils, and the temptation to graze all day means more trips through the line and more exposure.
Choose items that are visibly hot and freshly replenished. Avoid anything that looks like it’s been sitting out for a while, particularly dishes with mayonnaise, cream sauces, or raw shellfish. Use the tongs and spoons provided rather than your hands. If you’re at a port and eating ashore, stick to food that’s cooked to order and served hot. Salads and raw produce at local restaurants in some destinations carry a higher risk of traveler’s diarrhea than anything on the ship.
What Happens If You Get Sick Onboard
Cruise ships carry medical centers staffed by at least one physician and several nurses, scaling up on larger vessels to two doctors and five nurses. Ship physicians are credentialed to emergency medicine standards and certified in advanced cardiac life support. Most medical centers have X-ray machines, EKG equipment, defibrillators, and basic lab capabilities. They can handle heart attacks, strokes, broken bones, and common illnesses.
What they can’t do is perform surgery or manage complex conditions that require an ICU. If something serious happens, the ship coordinates an evacuation to the nearest port or, in some cases, a helicopter transfer. Medical care onboard is not covered by most standard health insurance plans, and costs are billed directly to you. Travel insurance that explicitly covers medical treatment and emergency evacuation at sea is worth the cost, especially for older travelers or anyone with a chronic health condition. Check the policy details: some plans exclude pre-existing conditions or have caps on evacuation costs that fall well short of what a helicopter airlift actually runs.
Manage Shared Spaces Wisely
Beyond hand hygiene, a few habits reduce your exposure to illness in the ship’s communal areas. Use your knuckle or elbow on elevator buttons. Avoid touching your face after using handrails. If someone at your dinner table is visibly sick, it’s perfectly reasonable to request a table change with the dining staff.
Pools and hot tubs are another vector. Cruise ship recreational water systems are regulated, but hot tubs in particular can harbor bacteria if chemical levels fluctuate with heavy use. Shower before and after using the pool or spa. If a hot tub looks cloudy or has a strong chemical smell, skip it.
Your cabin itself is cleaned daily, but wiping down the TV remote, light switches, safe keypad, and bathroom faucet handles with a disinfecting wipe when you first board (and periodically after) adds a layer of protection that takes about 60 seconds.