How long does Bali belly last? Day by day, and when to worry

The actual numbers

Two Australian government sources, and they agree closely enough to plan around. healthdirect, on gastroenteritis generally:

Vomiting usually lasts 1 to 2 days. Diarrhoea usually lasts around 1 to 3 days but can last up to 10 days.

The Better Health Channel, writing specifically about traveller's diarrhoea, calls it a self-limiting condition that clears up after a few days and puts the typical figure at around four. healthdirect adds the reassuring general line:

Most diarrhoea is mild and clears up in a few days without treatment.

Self-limiting is the key phrase. It means the illness ends because your body ends it, not because of anything you take. What you do in the meantime is keep the fluid up so the dehydration does not become the bigger problem.

What the days usually look like

This is the common shape rather than a rule, and plenty of people skip a stage or run a day ahead. It is here because knowing the pattern makes the middle of it much less frightening.

Improving is the word that matters. A slow recovery is fine. Static or worsening after several days is different, and is covered below.

The one week mark, and why it matters

A week is the line where the question changes from how long will this last to what is this. The bacteria and viruses behind most cases have finished by then. What does not finish on its own, or takes far longer, is a parasite.

healthdirect on giardiasis, which is the usual culprit for the long ones:

Symptoms of giardiasis start 3 to 25 days after infection with the parasite.

And on how long it goes:

They may last for months, especially if left untreated.

Months, not days. That is an entirely different illness wearing the same nickname, and it is diagnosed with a stool test rather than guessed at. The parasite page covers what to ask for and what treatment involves. healthdirect's general line is to see your doctor if symptoms continue for more than a couple of weeks, but with a travel history in the picture, a week is a reasonable point to go earlier.

What makes it last longer

• Not drinking enough. Dehydration makes everything worse and slower, and it is the single most common reason a traveller ends up on a clinic drip in Bali.
• Trying to carry on as normal. Heat, alcohol, a full day of scooters and a big dinner will all extend it. The trip is already interrupted; fighting that just makes the interruption longer.
• Eating too ambitiously too early. Appetite comes back before the gut is ready. Plain and small for a day or two after you feel better.
• Alcohol and coffee. healthdirect advises avoiding both while you have diarrhoea. A Bintang on day two is a false economy.
• A parasite rather than a bacterium. The single biggest reason for a case that runs for weeks. It needs identifying, not waiting out.
• Reinfection. Getting better and going straight back to the ice and salads that did it is a real pattern, and it looks like one long illness rather than two.

Feeling off after it ends

Very common, and usually not a sign anything is wrong. A gut that has just been through an infection can be sensitive for a week or two: unpredictable appetite, some bloating, a temporarily lower tolerance for dairy or rich food. That settles.

What is worth taking seriously is symptoms that persist or arrive after you have flown home, because the timeline back in Australia is easy to dismiss as something you ate here. Giardia's incubation stretches to 25 days, which is comfortably long enough to land after your holiday has finished. Bali belly after returning home is the page for that, and it matters more than people expect.

When to stop waiting and see someone

The timeline is only one input. healthdirect's red flags override the calendar entirely: severe diarrhoea, signs of dehydration (tiredness, passing much less urine, thirst, a dry mouth), heavy rectal bleeding, or diarrhoea with severe abdominal pain. Blood or mucus in the stool or a fever are also doctor territory regardless of what day it is.

Bali has a great deal of medical capacity for exactly this, from clinics that will come to your villa through to hospitals in Denpasar. Consultations are generally paid up front and claimed back later, which is a travel insurance question and one worth sorting before you fly. From Australia you can call healthdirect on 1800 022 222 to talk to a registered nurse at any hour, which is a useful sanity check if you are not sure whether to go in.

For babies, young children, older travellers, anyone pregnant and anyone managing a condition, the thresholds are much lower. What to do if you get Bali belly has the fuller version.