Bali belly is the rite of passage nobody wants. It is the local nickname for traveller’s diarrhoea, the upset stomach that catches a good share of visitors to Bali and much of Southeast Asia, usually in the first week. The good news is that it is rarely serious, it mostly clears up on its own, and a few simple habits cut the odds of getting it in the first place. The better news is that knowing what actually helps, and what to skip, gets you back on your feet faster. This guide covers how to avoid Bali belly, what to do if you get it, and the signs that mean it is time to see a doctor.

Key facts

  • Bali belly is traveller’s diarrhoea: loose, frequent stools, often with cramps, nausea and sometimes a mild fever, usually picked up from unfamiliar food or water.
  • Most cases are short and self-limiting, settling within a few days without any specific medicine.
  • Oral rehydration comes first. Replacing water and salts is what matters most, especially for anything beyond a mild case.
  • Anti-diarrhoeals such as loperamide ease symptoms only. Skip them if you have a high fever or blood in your stool, and see a doctor instead.
  • Antibiotics are not routine. Most cases do not need them; when a case is severe or not improving, that is a decision for a clinician, not a guess.
  • Some signs mean see a doctor: blood in the stool, high fever, significant dehydration, severe pain, or symptoms in a young child, an older person or anyone with a long-term condition.
  • A tiny kit of oral rehydration salts and hand sanitiser, packed before you travel, is worth more than anything you buy mid-flare.

What is Bali belly?

Bali belly is traveller’s diarrhoea: loose, frequent stools, often with stomach cramps, nausea, bloating and sometimes a mild fever. It is usually caused by picking up bacteria, and occasionally viruses or parasites, from food or water that your system is not used to. It is not a reflection on a restaurant’s cleanliness so much as your gut meeting unfamiliar bugs.

Most cases are unpleasant but short, settling within a few days. The two things that matter most are staying hydrated while it runs its course, and recognising the smaller number of cases that need a doctor. Everything else is about comfort and prevention.

How do I avoid Bali belly?

Be a bit careful with food and water in your first days, before your system adjusts. The CDC guidance on safe food and water boils down to a few practical habits:

  • Drink bottled or properly treated water, and use it for brushing your teeth too.
  • Be cautious with ice, since it is only as clean as the water it is made from.
  • Favour food that is freshly cooked and served hot, where heat has done the work.
  • Be careful with raw salads, unpeeled fruit, and food that has sat out at room temperature.
  • Peel fruit yourself, and lean towards busy places with a high turnover of fresh food.

None of this means living on plain rice. It means being a little selective early on, washing or sanitising your hands before eating, and using common sense about anything that looks like it has been sitting around. The aim is to enjoy Bali’s food while giving your gut a fair chance to keep up.

What should I do if I get Bali belly?

Rehydration comes first. Diarrhoea drains water and salts from your body, and dehydration is what actually makes people feel awful and occasionally lands them in a clinic. The CDC advice is to drink plenty, and for anything beyond mild cases to use oral rehydration salts, which replace water and salts together far better than water alone. These come as sachets you dissolve in clean water, they are inexpensive, and they are the one thing worth having in your bag before you ever need them.

Sip steadily rather than gulping, keep going even when you do not feel like it, and rest. The NHS advice for diarrhoea and vomiting is the same at its core: keep your fluids up, and ease back onto food as your appetite returns. Most people are through the worst within a couple of days if they stay ahead of the dehydration.

Can I take something to ease the symptoms?

Anti-diarrhoeal medicines such as loperamide can reduce how often you need to rush to the toilet, but they treat the symptom, not the cause. That makes them a comfort measure for a travel day or a long journey rather than a cure, and they are best used sparingly for ordinary, watery Bali belly.

One important caution from the CDC: anti-diarrhoeals are not the right choice if you have a high fever or blood in your stool, because in those cases slowing things down can do more harm than good. If that is your situation, skip the loperamide and see a doctor instead. Used sensibly, though, an anti-diarrhoeal can take the edge off while rehydration does the real work.

When are antibiotics needed for Bali belly?

Most Bali belly does not need antibiotics, and they should only be taken when a doctor judges a case needs them. Taking antibiotics when they are not warranted is its own problem, so they are not a routine first response to a runny tummy. The CDC notes that a doctor may give antibiotics to treat traveller’s diarrhoea in the cases that need it, typically the more severe ones or those that are not improving.

The medicines used for this are available in Bali, and a clinic can assess whether they are appropriate for you before you take anything. The common options for gut infections include azithromycin and rifaximin, and you can see the wider range in our digestive health category. The key point is that these are a targeted tool for specific situations, decided with a clinician, not something to self-prescribe to save a visit. If you want to understand how to buy and store medicines on the island, our guide to buying medicine in Bali walks through it.

When should I see a doctor?

Most Bali belly clears up with rest and fluids, but some signs mean it is time to get medical help rather than wait it out:

  • Blood in your stool, or black, tarry stools.
  • A high fever alongside the diarrhoea.
  • Signs of significant dehydration: very little urine, dizziness, a dry mouth, or feeling faint.
  • Severe stomach pain, or vomiting that stops you keeping fluids down.
  • Symptoms that drag on beyond a few days rather than easing.
  • Diarrhoea in a young child, an older person, or anyone with a long-term health condition, where dehydration sets in faster.

Bali has good clinics used to treating exactly this, so there is no need to tough out anything in the list above. A short visit and some fluids can turn a miserable week around quickly.

What should I pack in a small kit?

Oral rehydration salts, an anti-diarrhoeal for travel days, and hand sanitiser, packed before you travel. Because Bali belly so often strikes when you are least prepared, a tiny kit saves a bad night, and knowing where your nearest reputable clinic is before you need it saves another.

If you plan to bring any medicine of your own into the country, it is worth checking the rules first: our guide to bringing medication into Indonesia covers what to carry and what to declare, and the guide to buying medicine in Bali covers how pharmacies work on the island and how to find what you need by active ingredient.

Do and don’t

Do:

  • Pack oral rehydration salts before you travel, and start them early if diarrhoea sets in.
  • Drink bottled or treated water, and be cautious with ice and raw or room-temperature food in your first days.
  • Sip fluids steadily and keep going even when you do not feel like it.
  • See a doctor for blood in the stool, high fever, significant dehydration, or symptoms that are not improving.
  • Treat diarrhoea in a young child, an older person or anyone with a long-term condition as check-first, since they dehydrate faster.

Don’t:

  • Rely on anti-diarrhoeals if you have a high fever or blood in your stool.
  • Self-prescribe antibiotics to save a clinic visit; leave that decision to a doctor.
  • Tough out any of the warning signs above rather than getting seen.
  • Ignore fluids because you do not feel like drinking; dehydration is the real risk.

Frequently asked questions

How long does Bali belly last? Most cases are short, easing within a few days once you stay ahead of the dehydration. Symptoms that drag on beyond a few days, or that come with blood, high fever or significant dehydration, are a reason to see a doctor rather than wait.

Should I take probiotics for Bali belly? The mainstay is oral rehydration first, then rest and a gradual return to food. If you want to try anything else, ask a pharmacist or doctor, and do not let it delay fluids or a clinic visit if the warning signs appear.

Where to go next

Bali belly is common, usually short, and mostly preventable with a little food and water care in your first days. If it strikes, rehydration comes first, anti-diarrhoeals can ease the symptoms in ordinary cases, antibiotics are for the minority of cases a doctor judges need them, and the warning signs above mean it is time for a clinic. Browse by active ingredient, explore the digestive health category, see how ordering and delivery work, and read our guides to buying medicine in Bali and bringing medication into Indonesia for the wider picture.

This guide is general information, not medical advice. For severe symptoms, dehydration, blood in the stool, or anything that is not improving, see a doctor.