Medically reviewed by Dr. Ponlawat Pitsuwan, Physician, Takecare Clinic Phuket. Last reviewed: September 2026.
Food poisoning is one of the most common reasons visitors see me, often within hours of a seafood meal or a buffet left out in the heat. Most cases settle with fluids and rest, and my main job is to spot the few people who are becoming dangerously dehydrated.
Food poisoning often reaches us in pairs or small groups: friends who shared a seafood platter, a boat-trip lunch or a late-night market snack, and who began vomiting within hours of each other. Phuket’s heat makes that fluid loss bite harder, especially after a day in the sun or a night out. Treating the vomiting and dehydration early can turn a lost holiday week into a lost afternoon.
Toxin or infection: what a bad meal does to you
Food poisoning, also called foodborne illness, comes from food or drink contaminated with bacteria, viruses, parasites or bacterial toxins, and it falls into two groups. In toxin illness, bacteria such as Staphylococcus aureus and Bacillus cereus grow in food left warm and release a poison that reheating does not destroy. Cooked rice kept at room temperature, cream desserts, cold meats and buffet trays are classic sources. Symptoms start 30 minutes to 6 hours after the meal, vomiting leads, and it is usually over within a day.
In infection, live organisms such as norovirus, Salmonella, Campylobacter and Vibrio parahaemolyticus, a bacterium tied to raw seafood in coastal Asia, multiply inside the gut. They take 12 hours to several days to appear, bring more diarrhoea and fever, and can last several days.
Seafood reactions that are not infections
Scombroid, or histamine fish poisoning, follows tuna, mackerel or mahi-mahi that was not kept cold, causing flushing, a peppery taste, headache and a racing heart within an hour. It mimics an allergy and responds to antihistamines. Ciguatera, a toxin in some large reef fish, causes tingling lips and a reversal of hot and cold sensation.
How timing points to the cause
The gap between the meal and the first symptom is often the most useful clue we have.
| Time from meal | Likely cause | Typical foods | What stands out |
|---|---|---|---|
| Minutes to 1 hour | Scombroid fish poisoning | Tuna, mackerel, mahi-mahi stored warm | Flushing, headache, palpitations |
| 30 minutes to 6 hours | Staphylococcus or Bacillus cereus toxin | Fried rice, cream cakes, cold cuts, buffet food | Sudden forceful vomiting, little fever |
| 12 to 48 hours | Norovirus | Shellfish, salads, food handled by someone unwell | Vomiting and watery stools, spreads to roommates |
| 12 to 72 hours | Salmonella or Vibrio | Runny eggs, poultry, raw or undercooked seafood | Diarrhoea, cramps and fever |
| 2 to 5 days | Campylobacter | Undercooked chicken, unpasteurised milk | Marked cramping, fever, sometimes blood |
Food poisoning or something else?
Diarrhoea that builds over several days of travel, with no single culprit dish, fits the syndrome on our traveller’s diarrhoea treatment page. A burning ache high in the stomach after alcohol, spicy curries or painkillers, with little diarrhoea, suggests irritation of the stomach lining, covered under gastritis treatment. Pain that moves to the lower right abdomen and keeps worsening can be appendicitis. Vomiting with fever, a pounding headache and aching muscles in Phuket should raise dengue fever, and vomiting after a scooter fall is a head injury until proven otherwise.
How we assess and treat you at the clinic
We ask what you ate, when, whether anyone else is unwell and when you last passed urine, then check temperature, pulse and blood pressure, look for dehydration such as a dry mouth, and examine your abdomen to rule out a surgical cause. Most people need no tests. We send a stool test (a culture or PCR panel that names the organism) when there is blood, high fever or illness lasting several days, and after prolonged vomiting, blood tests for electrolytes (salts such as sodium and potassium) and kidney function, with same-day results from our on-site laboratory.
An anti-sickness medicine (antiemetic) such as ondansetron, as a melt-in-the-mouth tablet or injection, usually settles vomiting within the hour; domperidone is an alternative. If you cannot keep sips down, a drip of saline or balanced salt solution rehydrates far faster than drinking, as our page on IV drip therapy in Phuket explains. Antibiotics are not routine, because they do nothing against a toxin or a virus.
Looking after yourself while it passes
Oral rehydration salts (ORS), sold as sachets in every Phuket pharmacy, hold the right balance of salt and sugar to pull water back into your body. Mix one with the stated amount of bottled water and take small sips every few minutes, since big gulps tend to come straight back up. When hunger returns, start with plain rice, rice porridge, toast or bananas, and skip alcohol and rich curries for a day or two.
Paracetamol is the safest painkiller; avoid ibuprofen while dehydrated, as it strains the kidneys. Loperamide may help adults with watery stools and no fever, but not if there is blood. If loose stools outlast the vomiting, our guide to diarrhoea treatment takes over. With norovirus, wash hands with soap, since alcohol gel works poorly against it.
Why a bad meal hits harder in Phuket
Seafood carries the highest risk when served raw or barely cooked: oysters, raw prawns dressed in fish sauce and chilli, and spicy seafood salads. Island-hopping lunches often spend hours in a cool box, and buffet trays left in tropical heat give toxin-making bacteria exactly what they need. Add sun, alcohol and a long-haul flight, and a short illness dehydrates you far more than it would at home.
When to see a doctor
Most cases are over in one to two days. A temperature of 38.5°C or more, or constant rather than cramping pain, also needs a doctor, and pregnant women, older adults, young children and anyone with diabetes, kidney disease or a weakened immune system should be seen sooner.
Prevention and early detection
Favour busy stalls with quick turnover, treat raw shellfish as the riskiest item on any menu, particularly if you are pregnant or have a weakened immune system, and wash your hands with soap before eating. Early detection means catching dehydration: pale straw urine is fine, dark amber means you are falling behind, so start ORS at the first episode rather than waiting.
Getting seen quickly at Takecare Clinic
All three clinics are open 24 hours a day, 7 days a week: the Bangtao (Cherngtalay) clinic, the Kata-Karon clinic and the Patong clinic. Walk in and you are usually seen within minutes, or send a message on WhatsApp or call +66 81 718 9080 so we are ready. Most visits take under 30 minutes, though a drip adds time. Read more about our walk-in doctor in Phuket service.
If you cannot leave the bathroom, a doctor hotel visit in Phuket brings assessment, medicine and fluids to your room at any hour. We direct-bill most travel insurers and provide receipts, a medical report and an itemised invoice for claims. We confirm the price on WhatsApp before your visit.
Related services and treatments
If your symptoms do not fit a single bad meal, the stomach pages linked above will help you narrow it down, and our list of conditions we treat covers the rest.
Summary
Food poisoning comes on fast after a specific meal, is driven by a toxin or an infection, and usually clears within one to two days. Small sips of oral rehydration salts and plain food are the core of self-care, and antibiotics are rarely needed. If you cannot keep fluids down, see blood or feel faint, come in or ask for a hotel visit rather than waiting it out.
“Small, frequent sips of oral rehydration solution work better than large gulps of water. If you cannot keep fluids down for several hours, come and see us.”
Dr. Ponlawat Pitsuwan, Physician, Takecare Clinic Phuket
Frequently asked questions
Will my travel insurance pay for food poisoning treatment, and what will it cost?
Sudden illness such as food poisoning is covered by most travel insurance policies, but check your own wording. We direct-bill most travel insurers, and otherwise give you a receipt, medical report and itemised invoice to claim later. The cost depends on whether you need medicine only, tests or a drip, so we confirm the price on WhatsApp before your visit.
How soon will I feel better once I am treated?
Anti-sickness medicine usually calms vomiting within 30 to 60 minutes, and a drip often leaves dehydrated people noticeably stronger by the time the bag finishes. The illness itself still runs its course, usually under a day for toxin types and a few days for infections. Keep sipping fluids afterwards so you do not slip back into dehydration.
Can I just turn up while I am still vomiting, or do I need an appointment?
No appointment is needed. All three clinics take walk-ins around the clock, and anyone actively vomiting or visibly dehydrated is prioritised. Bring a plastic bag for the journey and a companion if you feel faint. A quick WhatsApp message beforehand lets the team prepare a bed and medicine so treatment starts the moment you arrive.
Is it possible to have a doctor treat food poisoning in my hotel room?
Yes. Our doctors visit hotels, villas and condos anywhere in Phuket, day or night. The visiting doctor checks your hydration, examines your abdomen, gives anti-sickness medicine and can run an intravenous drip in your room. If the examination suggests something more serious, such as appendicitis, we arrange hospital transfer directly from your room.
Should I be taking antibiotics for food poisoning?
Usually not. Most food poisoning is caused by toxins or viruses, and antibiotics touch neither while adding side effects and fuelling antibiotic resistance. We prescribe them when the picture suggests invasive bacterial infection, such as high fever with bloody diarrhoea, or for people with a weakened immune system. When we do, azithromycin is a common choice in Thailand.
Is it safe to fly home the day after food poisoning?
If the vomiting has stopped and you are drinking and passing urine normally, flying is usually fine. Cabin air is dry and toilets are limited, so a long flight while still vomiting can leave you badly dehydrated. If you fly within 24 to 48 hours and are not improving, come in early so we can treat you and advise whether you are fit to travel.
Sources
The NHS guide to food poisoning symptoms and self-care sets out when to seek help. The World Health Organization food safety fact sheet explains the main bacterial, viral and toxin causes. The CDC food safety pages cover prevention and high-risk groups.
food poisoning, foodborne illness, gastroenteritis, scombroid fish poisoning, ciguatera, Staphylococcus aureus, Bacillus cereus, norovirus, Salmonella, Campylobacter, Vibrio parahaemolyticus, ondansetron, domperidone, metoclopramide, oral rehydration salts, intravenous fluids, stool culture, electrolytes, NHS, WHO, CDC, Bangtao, Cherngtalay, Kata, Karon, Patong, Takecare Clinic Phuket, Dr. Ponlawat Pitsuwan
This page is general health information and not a substitute for a medical consultation.