What Is Bali Belly? (And What to Do If You Get It)

Before I visited Bali I had heard of something called Bali belly. I wasn’t sure exactly what it was, but I knew it didn’t sound good. A month on the island gave me a fairly direct lesson.

Bali belly is the local nickname for travellers’ diarrhoea: sudden loose stools, often with cramps, nausea or vomiting, caused by contaminated food or water. Most uncomplicated cases improve with rest and fluids. The immediate job is avoiding dehydration, not identifying the exact offending spring roll.

I didn’t get it. My girlfriend got it badly enough to need a doctor and antibiotics. Same trip, much of the same food… completely different outcome.

What Happened to Us

When I was in Bali I was there for a month and did all the things you aren’t meant to do;

I drank the water. Ate pretty much only street food from dodgy (but delicious) warungs. Had ice, fruit, veggies, you name it.

I didn’t get sick at all.

Meanwhile, my girlfriend got horrendous Bali belly. Enough to warrant a doctor’s visit and antibiotics. We’re pretty sure it was from some babi guling (roast pork) that we both ate, but can’t be 100% sure… and I ate the same meal without a problem.

So the takeaway is that your individual mileage may vary. You can be careful and still get unlucky; you can also eat your way around local warungs for a month and be completely fine. This is my experience, not a diagnosis or a replacement for medical advice.

What Actually Causes Bali Belly?

Bali belly is not one specific bug. It sits under the broad travellers’ diarrhoea label and can be caused by bacteria, viruses or parasites picked up through contaminated food, water, hands or surfaces. That is why two people sharing a meal can have very different weeks afterwards.

It also is not meaningfully separate from ‘food poisoning.’ Food poisoning is another broad everyday label for illness caused by contaminated food, including infections and toxins. Unless a clinician tests you, arguing over which label applies does not make the bathroom any more pleasant.

The CDC Yellow Book notes that even travellers who follow food rules can still become ill. Restaurant hygiene and wider sanitation systems matter, and most of that is outside your control. You are reducing risk, not unlocking immunity.

Symptoms and How Long It Lasts

The classic version arrives fairly suddenly: repeated loose or watery stools, stomach cramps and an urgent new relationship with the nearest toilet. Nausea, vomiting, tiredness and a mild fever can come along too. Blood, high fever or severe pain are not details to casually file under ‘normal Bali belly.’

There is no single countdown because the name covers several possible infections. A mild uncomplicated episode may settle within a few days, while some bacterial and parasitic illnesses last longer or return after seeming to improve. How long it has lasted is useful information for a doctor; it is not a reliable way to diagnose the cause yourself.

Dehydration is the practical danger. Watch for very dark or infrequent urine, dry mouth, dizziness when standing, unusual sleepiness or being unable to keep fluids down. Children, older travellers and people with existing health conditions can become dehydrated faster.

How I Would Reduce the Risk

Do the simple things that do not ruin the trip. Drink sealed bottled or properly filtered water, use it for brushing your teeth if you want the cautious option, wash or sanitise your hands before eating, and favour food that is freshly cooked and served properly hot.

With ice, the source matters. Ice made commercially from treated water is not automatically dangerous; mystery ice from an uncertain water supply is a different proposition. The same principle applies to cut fruit, salads and garnishes: freshly prepared and washed with safe water is better than something sitting warm for hours.

I would not tell anyone to avoid warungs. A busy local place turning food over quickly can be a much better bet than an empty Western restaurant keeping a buffet alive through sheer optimism. Look for steady trade, food cooked in front of you, clean hands and utensils, and ingredients protected from flies and heat.

For brushing teeth, bottled or properly filtered water is the low-effort cautious choice. In the shower, keep your mouth closed and carry on with your life. Accidentally swallowing a drop is not a guaranteed three-day sentence; just avoid deliberately drinking from the tap.

Tip: Pack a couple of oral rehydration sachets before the trip. Bali has plenty of pharmacies, but finding one is substantially less fun once you are already attached to the hotel bathroom.

What to Do If You Get Bali Belly

Start with fluids. Small, frequent sips are easier if you feel nauseous, and oral rehydration solution replaces both water and salts more effectively when losses are heavy. Mix sachets only with sealed, boiled or otherwise purified water and follow the packet volume exactly.

Eat when you feel able. Plain rice, toast, bananas, soup or whatever simple food you can tolerate is fine, but you do not need to starve yourself or follow an elaborate beige-food ritual. Avoid a heroic return to cocktails while you are still dehydrated.

Loperamide can reduce diarrhoea for an adult who needs symptom relief, but it is not suitable as solo treatment when there is blood in the stool or fever. Ask a pharmacist or doctor if you are unsure, particularly if you have other medical conditions or take regular medication.

Antibiotics are not the automatic Bali belly treatment. Mild cases often resolve with hydration alone, while unnecessary antibiotics can cause side effects and contribute to antimicrobial resistance. My girlfriend was assessed by a doctor before receiving them. That is the important half of that sentence.

What I Would Pack Before Bali

My tiny stomach kit would be oral rehydration sachets, hand sanitiser, a thermometer and any usual medication you already know you tolerate. Add the contact details for your insurer and a nearby clinic once you know where you are staying. None of this takes much room; all of it becomes oddly valuable at 2am.

If you have a medical condition, are pregnant, are travelling with young children or are heading somewhere remote, talk to a travel-health clinician before leaving. They can advise whether carrying a specific standby medicine makes sense for you. That is a personal medical plan, not something to copy from a stranger’s packing list.

When to See a Doctor

Heads up: Get medical help promptly for blood in the stool, high fever, severe abdominal pain, confusion, faintness, very little urine, persistent vomiting that prevents drinking, or other signs of dehydration. Seek advice earlier for young children, older adults, pregnancy, immune suppression or significant existing illness.

Talk to a clinician if symptoms are severe, are getting worse, or are not settling after a few days. Persistent diarrhoea after travel can need testing for a bacterial or parasitic cause. Both the WHO and CDC put rehydration at the centre of treatment, but neither suggests waiting out obvious red flags beside the pool.

If you need care in Bali, ask your accommodation or insurer for a reputable clinic and keep receipts, prescriptions and any medical report. A phone with working data makes this much easier when you are away from the hotel, which is one reason I sort an eSIM before landing.

Would I Worry About It Before Going to Bali?

No. I would take the risk seriously enough to drink safe water, pack rehydration salts and know when to see a doctor. I would not let it turn a brilliant food destination into two weeks of plain hotel pasta.

Eat the babi guling. Try the satay. Sit down at the busy little warung. Just use normal food-and-water judgement, wash your hands, and accept that travel occasionally involves losing a day to your digestive system.

Before travelling, check what your travel insurance covers for overseas medical care and keep the assistance number somewhere accessible. Hopefully it remains completely useless information.