Got food poisoning or a stomach bug in Tokyo? Self-care basics, warning signs that need a doctor, and how to find English-speaking clinics.
Tokyo has some of the strictest food hygiene standards in the world, and tap water throughout the city is safe to drink according to the Tokyo Metropolitan Government Bureau of Waterworks. Even so, stomach trouble is one of the most common health complaints among tourists. Traveler's diarrhea in Japan is less frequent than in many other destinations, but it still happens.
Typical culprits are not dramatic: unfamiliar ingredients, richer or oilier meals than your stomach is used to, raw seafood eaten for the first time, more alcohol than usual, and the general stress of jet lag and long days on your feet. In winter, norovirus circulates in Japan just as it does elsewhere, and viral gastroenteritis can spread in crowded places regardless of how careful you are with food.
Most mild cases of food poisoning or a stomach bug settle within one to three days. The core of self-care is simple: rest in your hotel room and replace lost fluids. Take small, frequent sips rather than large gulps, which can trigger more vomiting. Once your appetite returns, start with plain, bland food such as rice or plain bread, and hold off on alcohol, coffee, and spicy or oily dishes until you feel normal again.
If you want something to ease symptoms, speak to a pharmacist at a local drugstore — many in central Tokyo have English-speaking staff who can suggest suitable options based on your symptoms and any medication you already take. If your condition warrants it, a doctor may prescribe treatment after examining you. Avoid guessing at unfamiliar products on the shelf by package design alone.
Do not wait out the following symptoms — see a doctor the same day: blood in your vomit or stool; vomiting that persists so you cannot keep any fluids down; signs of dehydration such as dizziness when standing, a dry mouth, dark urine, or urinating very little; a high fever; or severe, worsening abdominal pain. Symptoms lasting more than three days also deserve a professional assessment.
Be extra cautious with young children, older travelers, pregnant women, and anyone with a chronic condition such as diabetes — they dehydrate faster and should be seen earlier rather than later. If you are too unwell to leave your room, ask the hotel front desk to help arrange care, or request a house-call doctor rather than struggling to a clinic on your own.
For stomach symptoms, look for a gastroenterology clinic (shokaki-naika) or a general internal medicine clinic (naika). The Japan National Tourism Organization runs an official multilingual search for medical institutions that treat foreign visitors, which is a reliable starting point.
MediFind Tokyo makes this faster: open the map, tap the 🤢 Stomach filter to see English-speaking gastroenterology and internal medicine clinics near you, or message our team by WhatsApp or email if you are unsure where to go. If you are too sick to leave your hotel, you can request a house-call visit through the same service. Bring your passport to any appointment; without Japanese insurance you pay the full cost upfront, so keep every receipt.
Travel insurers almost always ask for documentation, and it is far easier to collect it at the clinic than to request it after you fly home. Ask for the itemized medical statement and the official receipt at checkout — Japanese clinics issue both as standard. If your policy requires a diagnosis, request a medical certificate; clinics usually charge an extra fee for it, and some can issue it in English if you ask.
Also keep pharmacy receipts, receipts for taxis to and from the clinic if your policy covers transport, and a simple note of when symptoms started and what you ate beforehand. Contact your insurer as soon as you reasonably can — many have 24-hour assistance lines and can tell you exactly which documents they need before you leave Japan.
Q. I think I have food poisoning in Tokyo — what should I do first?
A. Rest, take small frequent sips of fluid, and eat only bland food once you can. Most cases improve within one to three days. If you see blood, cannot keep fluids down, have a high fever, or feel signs of dehydration, see a doctor immediately — ask your hotel front desk to help arrange it if needed.
Q. Is traveler's diarrhea common in Japan? Can I drink the tap water?
A. Traveler's diarrhea in Japan is less common than in many destinations. Tap water in Tokyo is safe to drink according to the Tokyo Metropolitan Government Bureau of Waterworks, so unfamiliar food, alcohol, fatigue, or a virus is the more likely cause of a stomach bug.
Q. How do I find an English-speaking doctor for a stomach bug as a tourist?
A. Use the JNTO official medical institution search, or open the MediFind Tokyo map and tap the 🤢 Stomach filter to find English-speaking gastroenterology and internal medicine clinics near you. If you cannot leave your hotel, a house-call visit can be requested instead.
Q. What documents do I need for a travel insurance claim after seeing a doctor in Tokyo?
A. Keep the itemized medical statement, the official receipt, all pharmacy receipts, and — if your policy requires it — a medical certificate stating the diagnosis (usually issued for an extra fee). Contact your insurer before leaving Japan to confirm exactly what they need.