Most travellers stay healthy in Bangkok, and the few problems that do come up are predictable and treatable. Before you fly, make sure your routine vaccines are current and consider hepatitis A, typhoid and rabies. In the city the real risks are dehydration and heat, an upset stomach from food or water, and mosquito-borne dengue rather than malaria. If something goes wrong, you can see an English-speaking doctor the same day at a walk-in clinic, and for anything after an animal bite or a possible HIV exposure the clock matters, so come in quickly.
Clinically reviewed by Dr. Ponlawat Pitsuwan, Physician, Doctor Bangkok. Last reviewed: July 2026.
In everyday practice at our Sukhumvit clinic, the travellers who run into trouble are rarely the ones who did something reckless. They are the people who did not know that Bangkok tap water is not for drinking, that a small scratch from a stray cat still counts as a rabies exposure, or that the afternoon heat can drain you faster than a hangover. Travel health is mostly about knowing these few things in advance. This guide walks through what to sort out before you arrive, how to stay well while you are here, and exactly what to do if you get sick.
Before you go: vaccines and a pre-travel check
Your first job is to make sure your routine vaccinations are up to date, including measles, tetanus and an annual influenza shot. For Thailand specifically, hepatitis A is recommended for almost every traveller because it spreads through contaminated food and water, and typhoid is worth having if you plan to eat widely or travel outside the main tourist areas. Rabies deserves serious thought because Thailand is a rabies-endemic country and stray dogs and monkeys are common; a pre-travel course simplifies treatment if you are bitten later. Hepatitis B, Japanese encephalitis and other vaccines depend on how long you are staying and what you plan to do. There is no yellow fever risk in Thailand, and a certificate is only required if you are arriving from a country where yellow fever is present. Most travel vaccines need at least two to four weeks before departure to work properly, so plan early. Our full guide to travel vaccinations for Thailand covers each one, and if you are still at home a pre-travel health check ties it together.
Food and water: avoiding Bangkok belly
The single most common problem we see in travellers is an upset stomach, often called Bangkok belly. It is usually mild traveller’s diarrhoea caused by unfamiliar bacteria in food or water, and it typically settles within three to five days. Bangkok tap water is treated at the source but is not safe to drink straight from the tap, so stick to bottled or filtered water, and be sensible with ice from street stalls in the hottest months. Street food itself is not the enemy; the safest choices are dishes cooked fresh and served hot in front of you, while pre-cut fruit left out in the heat and lukewarm buffet food carry more risk. If you do get caught out, the priority is fluids and oral rehydration salts rather than rushing to antibiotics. You can read exactly what to do if you have diarrhoea in Bangkok, and whether the tap water is safe. Come in if it is not settling, covered under when to see a doctor below.
Heat, sun and dehydration
Bangkok is hot and humid all year, and the heat causes more travellers to feel unwell than most people expect. Fluid loss begins before you feel thirsty, and mild dehydration brings on the headache, fatigue and dizziness that many visitors mistake for jet lag or a hangover. Heat exhaustion, with heavy sweating, weakness and nausea, is a warning sign to stop, get into the shade or air conditioning, and rehydrate. Heat stroke, where the body stops sweating and the person becomes confused or collapses, is a medical emergency. Pace your sightseeing, favour mornings and late afternoons, and drink steadily through the day. When dehydration is more than mild, a medically supervised IV drip restores fluids and electrolytes quickly; our article on dehydration in Bangkok and the guide to heat stroke explain the difference and when it becomes serious.
Mosquitoes and tropical disease
There is no malaria risk in Bangkok itself; malaria in Thailand is confined to a few forested border areas. The mosquito-borne infection that matters in the city is dengue fever, carried by a mosquito that bites during the day, so repellent is worth using in daylight and not only at dusk. Dengue causes high fever, severe headache, pain behind the eyes and body aches, usually a few days after being bitten. Most cases recover with rest and fluids, but any high fever that arrives with a rash should be assessed rather than left, because dengue needs monitoring. Our guides on dengue, malaria and zika, on what actually works against mosquitoes, and on fever with a rash go into detail, and any persistent fever can be checked at the clinic.
Animal bites, cuts and the sea
Thailand is rabies-endemic, and this is the one area where a small injury can become a life-threatening problem if it is ignored. If a dog, cat or monkey bites or even scratches you and breaks the skin, wash the wound with soap and running water for fifteen minutes and come in the same day for post-exposure treatment, which is highly effective when started promptly and far less useful once symptoms appear. Our step-by-step guide on what to do after a dog bite in Bangkok and the rabies vaccination page explain the schedule. At the beach, a jellyfish sting should be rinsed with seawater or vinegar rather than fresh water, and coral cuts and sea urchin spines can become infected, so wounds that are dirty, deep or not healing need proper wound care. Our guide to jellyfish and sea urchin stings covers the first-aid steps.
Sexual health for travellers
Sexual health is a normal part of travel medicine, and testing in Bangkok is confidential, judgement-free and often same-day. After unprotected sex, a full STD test or HIV test gives you a clear answer, and it is worth knowing that emergency HIV prevention, called PEP, has to be started within seventy-two hours of a possible exposure to work, so this is genuinely time-critical. If you expect to be at ongoing risk, PrEP prevents HIV before exposure. Our PrEP and PEP guide explains both.
Travel insurance and how paying for care works
Private clinics and hospitals in Thailand expect payment at the time of treatment, and you then claim the cost back from your travel insurer, so keep every receipt. For most claims your insurer will also want a medical certificate describing the diagnosis and treatment, which we can provide the same day; see our medical certificate page. Take out travel insurance before you fly and check that it covers medical treatment and, ideally, emergency evacuation, because the one thing you cannot buy after an accident is cover you did not arrange beforehand.
How to see an English-speaking doctor in Bangkok
You do not need to navigate a large hospital for everyday problems. For a stomach bug, a fever, a minor injury, a vaccination or a health certificate, an English-speaking doctor at a walk-in clinic in Bangkok can see you quickly, and if you are too unwell to travel, a doctor can visit your hotel. For anything severe, such as chest pain, breathing difficulty, a serious accident or the confusion of heat stroke, treat it as an emergency and seek emergency care straight away.
See a doctor if: your diarrhoea lasts more than a few days, contains blood, or comes with a high fever or signs of dehydration such as very dark urine and dizziness; you have any fever above 39 degrees, or a fever with a rash, which in Bangkok is treated as dengue until proven otherwise; you have been bitten or scratched by any animal, however minor it looks; you have symptoms of heat stroke such as confusion or a lack of sweating in a very hot person; or you have had a possible HIV exposure, where PEP must begin within seventy-two hours.
Prevention and early detection
Almost everything in this guide is preventable with a little preparation. Sort your vaccines two to four weeks before you fly, so hepatitis A, typhoid and, where appropriate, rabies protection are in place before you arrive. Drink bottled or filtered water, choose food that is cooked fresh and served hot, and carry oral rehydration salts so a mild stomach upset never becomes dehydration. Use mosquito repellent in the daytime, pace yourself in the heat and drink steadily rather than waiting until you are thirsty. Carry a small travel kit with rehydration salts, paracetamol, plasters and any regular medicines in their original packaging. If you take regular medication, bring enough for the trip plus a few spare days. These simple habits prevent the large majority of travel-health problems we see.
Summary
Bangkok is a straightforward place to stay healthy once you know the handful of risks that actually matter here. Get your vaccines organised early, be sensible with food, water and the heat, respect the rabies risk from animals, and remember that dengue rather than malaria is the mosquito concern in the city. When something does go wrong, help is close, English-speaking and same-day. As I tell patients at the clinic, travel health is not about being anxious, it is about being ready: the traveller who packed rehydration salts and knew to wash a bite wound and come straight in is the one who turns a scare into a footnote. If in doubt, come and see us, and we will sort it out quickly.
Frequently asked questions
Do I need vaccines to visit Thailand?
You are not legally required to have any vaccine to enter Thailand unless you are arriving from a country with yellow fever. Medically, though, make sure your routine vaccines are current and strongly consider hepatitis A, typhoid and rabies. Plan two to four weeks ahead so they have time to work.
Can I drink the tap water in Bangkok?
No. Bangkok tap water is treated but is not safe to drink straight from the tap. Use bottled or filtered water for drinking and brushing your teeth, and be cautious with ice from informal street stalls. Sealed bottled water and ice from reputable cafes and restaurants are fine.
Is there malaria in Bangkok?
No. There is no malaria in Bangkok, and malaria in Thailand is limited to a few forested areas near the borders. The mosquito-borne infection to watch for in the city is dengue, which is why daytime mosquito protection matters.
What should I do if a dog or monkey bites me?
Wash the wound with soap and running water for fifteen minutes and come in for rabies post-exposure treatment the same day, even if the bite or scratch looks minor. Thailand is rabies-endemic and the treatment is very effective when started early, but rabies is almost always fatal once symptoms appear.
How do I see an English-speaking doctor quickly?
Walk in to an English-speaking clinic for everyday problems such as stomach upsets, fevers, minor injuries, vaccinations and health certificates, and you will usually be seen the same day. If you are too unwell to travel, a doctor can visit your hotel. For anything severe, go straight to emergency care.
Does travel insurance cover a clinic visit?
Most travel insurance policies cover medically necessary treatment, but private clinics expect payment at the time and you then claim it back. Keep your receipts and ask for a medical certificate, which insurers usually require, and check before you travel that your policy includes medical care and emergency evacuation.
Sources
Centers for Disease Control and Prevention (CDC), Travelers’ Health: Thailand. World Health Organization (WHO), International travel and health. NHS, Travel vaccinations. These sources informed the vaccination, food and water, and infectious disease guidance above.