Diarrhea in Tokyo? What to Do Right Now

Diarrhea while traveling is common — often called "traveler's diarrhea" — and is usually caused by a change in food or water. Most cases are mild and improve within a few days.

This page helps you decide what to do next — rest at your hotel, arrange a same-day doctor visit, or seek emergency care. TOKYO CLINIC sends English-speaking doctors directly to your hotel in central Tokyo, usually within 60–90 minutes.

At a Glance

  • English-speaking physician
  • Same-day hotel visits
  • Physical examination
  • Testing when appropriate
  • Medication may be provided
  • Medical certificates available
  • Hospital referral when necessary

What Should I Do Now?

Mild, infrequent loose stools Rest, a bland diet, and fluids — monitor for 24 hours.
Frequent watery stools, cramping, or mild fever Arrange a same-day medical assessment — message us on WhatsApp and a doctor can visit your hotel.
Blood in stool, high fever, or signs of dehydration Call 119 immediately, or ask hotel staff to call for you.

When Should I Seek Emergency Care?

Call 119 for an ambulance (or ask hotel staff to call) if your diarrhea comes with any of the following:

  • Blood or mucus in your stool
  • High fever (above 39°C / 102°F) with chills
  • Signs of severe dehydration — dizziness, confusion, or little to no urination
  • Severe abdominal pain
  • Diarrhea lasting more than 3 days with no improvement
  • Signs of dehydration in an elderly traveler or young child

Can I Stay in My Hotel?

If none of the emergency signs above apply, you can usually stay at your hotel while a doctor examines and treats you. If your symptoms suddenly get worse, or you notice any of the emergency signs above — even while you're waiting for the doctor — call 119 right away rather than wait for us. TOKYO CLINIC is here to help with non-emergency care; it should never delay emergency treatment.

How Does a Doctor Visit Work?

  1. Contact TOKYO CLINIC by WhatsApp or email with your symptoms and hotel name.
  2. A doctor visits your hotel, typically within 60–90 minutes.
  3. Examination, and stool or other testing if appropriate.
  4. Medication is provided or arranged on the spot in most cases.
  5. A hospital referral is arranged if your condition needs further care.
  6. A medical certificate is issued on request, for insurance or airline purposes.

Common Causes of Diarrhea

  • Traveler's diarrhea — from a change in food or water; the most common cause among travelers.
  • Bacterial infection — such as E. coli, Salmonella, or Campylobacter, from contaminated food.
  • Viral gastroenteritis — highly contagious, often accompanied by vomiting.
  • Parasites — less common, but possible with untreated water or certain foods.
  • Food intolerance — unfamiliar or spicy foods can irritate the digestive system.
  • Stress or jet lag — can affect digestion while traveling.

How Diarrhea Is Assessed

  • History — onset, frequency, and appearance of stools, food/water exposure, medications, in English.
  • Examination — abdominal exam, hydration status, and temperature.
  • Testing — stool or other tests performed when appropriate.
  • Clear explanation — the doctor explains the likely cause and what it means for your trip.

Possible Treatment

  • Symptom relief — anti-diarrheal medication when appropriate.
  • Rehydration advice — oral rehydration solutions and fluids.
  • Antibiotics — only when a bacterial infection is confirmed.
  • Hospital referral — if severe dehydration or another serious condition is suspected.

Frequently Asked Questions

Is it traveler's diarrhea?

Often, yes — a change in food or water is the most common cause of diarrhea in travelers. The doctor can help confirm the cause and advise on treatment.

Do I need antibiotics?

Only if a bacterial infection is confirmed. Most travelers' diarrhea is viral or related to diet, and antibiotics won't help in that case.

Can I fly tomorrow?

Often yes, if your symptoms are mild and improving with no red-flag signs. The doctor can advise based on your specific case and provide documentation if needed.

Can I get a medical certificate?

Yes, for travel insurance claims or airline documentation.

Will the doctor speak English?

Yes. All doctors seeing international patients are English-speaking, from first contact to the visit itself.

Should I go to a hospital?

Not usually. Most diarrhea can be safely assessed and treated at your hotel. A hospital referral is arranged only if your condition needs care beyond a house call, such as severe dehydration.

Feel Unwell in Tokyo?

Message us now — Doctor in as little as 60 minutes.

Or email tkyclnc@tokyoclinicjapan.com