Food poisoning abroad: prevention and treatment

Anything eaten raw or kept warm is where the risk concentrates. Raw herbs and salad leaves are the classic example: the basil, mint and lettuce served with Vietnamese noodle dishes or Thai larb are usually rinsed in tap water. Locals eat them daily and most visitors are fine, but if your stomach is new to the region, go lighter for the first few days.

Cut fruit sitting in a glass cabinet in the sun, shellfish (especially raw or lightly cooked clams and oysters), raw or runny eggs, mayonnaise and pâté that have been out since morning, and sauces kept in warm bowls all deserve a second look. Reheated rice is a less obvious one: cooked rice left at room temperature can grow bacteria whose toxins survive a quick stir-fry. Fried rice from a busy stall is fine; a pot of rice sitting out from lunch until dinner is not.

Buffets are a common source of trouble for travellers because food sits in the warm band for hours. If you eat from one, take what is being replenished or kept genuinely hot, and skip anything that has clearly been out since the start of service.

Alcohol and caffeine do not cause food poisoning, but they make dehydration worse once you are ill. Go easy on both while you recover.

Work through these in order. The first three steps handle the great majority of cases without a clinic.

1. Stop and assess. Note when symptoms started and what you ate in the previous 48 hours. Most bacterial cases appear 6–48 hours after the meal. If you have bloody stool, a fever above 38.5 °C, severe abdominal pain, or you cannot keep any fluid down, skip to step 5.

2. Replace fluid and salt. Mix oral rehydration salts with safe water and sip steadily — small amounts every few minutes if you feel nauseous. ORS replaces what you lose far better than plain water or sugary soft drinks. Pharmacies across most of Asia, Africa and Latin America sell ORS sachets cheaply without a prescription.

3. Rest and eat simply. Plain rice, toast, bananas, plain noodles or crackers when you feel able. Avoid alcohol, very fatty food and large amounts of caffeine. There is no need to starve yourself; eat what you can tolerate.

4. Consider anti-diarrhoeal medicine carefully. Loperamide (Imodium) can help on a long bus or flight, but do not use it if you have blood in your stool or a high fever, because it slows the gut and keeps the infection in. Antibiotics should only be taken on a doctor's advice — resistance patterns differ by country, and self-treating with leftover pills is a common mistake.

5. Get medical help. Private international clinics in major cities treat traveller's diarrhoea every day and usually speak English. Public hospitals are cheaper but can involve long waits. Call your travel insurance emergency line first if you can; many insurers direct you to a specific clinic and can confirm cover before you are treated.

Most of the cost of food poisoning abroad is time, not money. A mild case usually costs you one to three days of your trip. Budget for a quiet day, a nearby pharmacy and a hotel room you can stay in.

Pharmacy items are cheap in most of the world. A box of ORS sachets and basic anti-diarrhoeal medicine typically cost a few dollars or the local equivalent; 2026 estimate. Prices vary by country and brand, so treat any figure as a band rather than a fixed price.

A private clinic consultation is the larger cost. In many countries a walk-in visit with a doctor, basic tests and medication runs from roughly USD 50 to USD 250, and higher in places like Singapore, Hong Kong, Japan or the Gulf states; 2026 estimate. Public hospitals are usually much cheaper for residents and sometimes for visitors, but waiting times can be long and English may be limited.

Travel insurance is the lever here. Medically necessary treatment for an illness that starts during your trip is normally covered by a standard policy, but you usually need to call the insurer's emergency line before non-urgent treatment, and you must keep every receipt and discharge note. Check your policy for the excess, the sub-limits and whether they require pre-authorisation.

If you are too ill to travel, note that most transport tickets are not refundable by default. Some airlines and rail operators will rebook you for a fee, and comprehensive insurance may cover the change. Keep documentation from the doctor — a dated note is what an insurer asks for.

Children dehydrate faster than adults and can go downhill within hours. Do not wait a day to see if it settles; seek care early, and use ORS made to the correct dilution for their age.

Pregnant travellers should see a doctor rather than self-treat, because dehydration and some infections carry extra risk, and some medicines are not suitable in pregnancy.

Older travellers and anyone with a chronic condition — diabetes, kidney disease, heart disease, or a suppressed immune system — should lower the threshold for seeking care. Dehydration and electrolyte loss hit harder with these conditions.

Anyone with a serious food allergy should carry medication, including adrenaline auto-injectors if prescribed, and a card in the local language naming the allergen and saying it is dangerous, not a preference. Shared oil and woks mean cross-contact is likely even when an ingredient is left out.

Long-term travellers and people working abroad should know the local emergency number and the nearest clinic before they need it. In remote areas, evacuation to a city hospital can be the biggest cost of the whole trip, which is why medical evacuation cover matters more than the small stuff.

If you are travelling with a group, agree in advance who holds the insurance details and the emergency numbers, so one person is not doing all of it while unwell.

A little preparation removes most of the panic. Pack ORS sachets, a small thermometer, alcohol hand gel and any regular medication in your carry-on, with a copy of the prescription. Check that your travel insurance covers medical treatment and evacuation, and save the emergency number in your phone.

Check the destination's health advice before you go. Government travel health services publish country-by-country guidance on food and water, vaccinations and current outbreaks; the advice changes, so read it close to departure rather than months ahead.

Download offline maps and a translation app before you fly. If you need a pharmacy or clinic in a city where you do not speak the language, an offline map and a saved phrase card get you there faster than asking around.

Keep a photo of your passport, insurance policy and prescriptions in cloud storage and on your phone. If you lose the paper copies, the photos are what a clinic or insurer will accept.

The questions travellers ask most about food poisoning abroad, answered directly.