Indonesia health officials outline travel risks behind “Bali belly”

Denpasar — “Bali belly” is a popular nickname for traveller’s diarrhoea, not a condition unique to the island, according to an explainer published by Indonesia’s Ministry of Health in early February 2026. The ministry says most cases in visitors are linked to gastrointestinal infections acquired from contaminated food or water, and outlines common symptoms, risk factors and basic prevention measures.

The explainer, written by Dini Yulia of RSUP Prof. dr. I.G.N.G. Ngoerah in Denpasar, defines Bali belly as a digestive disorder that can affect travellers when local hygiene and sanitation conditions differ from those in their home environment. It notes that similar illness can occur in many destinations worldwide, and that the term Bali belly refers to the syndrome rather than to any Bali‑specific pathogen.

According to the ministry, infection usually follows consumption of unsafe food or drinks. The article groups likely causes into three categories: bacteria such as Escherichia coli, Salmonella and Campylobacter; viruses including norovirus and rotavirus; and parasites such as Giardia and Cryptosporidium. International travel medicine guidance similarly identifies these organisms as leading causes of traveller’s diarrhoea in high‑risk destinations.

Food, water and climate as risk factors

The Health Ministry notes that Bali’s warm and humid climate can allow pathogens to multiply rapidly in food that is not stored or cooked properly. Periods of heavy rain can worsen sanitation problems, including potential mixing of drainage systems, and may increase the risk of water source contamination.

The explainer advises travellers not to drink tap water directly in Bali. It warns that exposure can also occur through ice made from untreated water, or through fruit and vegetables washed in unsafe water. International advice on traveller’s diarrhoea likewise recommends avoiding untreated tap water, ice of uncertain origin, raw salads and unpeeled fruit in areas where sanitation is inadequate.

Street food is highlighted as another possible route of infection when hygiene standards are poor or food is left at room temperature. The ministry also identifies raw vegetables and seafood that is not fresh as potential risks. According to overseas travel health guides, cooked food served steaming hot is generally safest, while raw or undercooked meat, fish and shellfish, and food held at room temperature for long periods should be avoided.

The ministry notes that some visitors, particularly those from Western countries, may be more vulnerable because their existing gut bacteria differ from local flora and they are not yet adapted to new pathogens. The article does not attempt to quantify incidence rates by region of Bali or by type of establishment, and it does not label any particular outlet as unsafe.

Prevention: “boil it, cook it, peel it, or forget it”

For prevention, the Health Ministry reiterates the long‑standing travel medicine rule of thumb: “boil it, cook it, peel it, or forget it.” This phrase is widely used in international guidance on safe food and water for travellers, including advice from the US Centers for Disease Control and Prevention and clinical reviews of traveller’s diarrhoea. In practice, the ministry encourages visitors to choose well‑cooked food served hot and to peel fruit themselves rather than relying on produce washed elsewhere.

Other practical steps drawn from the ministry’s guidance include drinking bottled water rather than untreated tap water, using bottled water when brushing teeth, being cautious with ice unless its source is known, and cleaning hands with alcohol‑based hand sanitiser before meals. International sources emphasise that careful food and beverage choices and regular hand hygiene are central to reducing the risk of traveller’s diarrhoea.

Hydration and when to seek care

For travellers who develop symptoms, the ministry stresses that rehydration is the immediate priority. It recommends oral rehydration solution (ORS), known in Indonesia as oralit, or electrolyte drinks to replace lost fluids and salts. ORS based on the World Health Organization formula is widely endorsed in global guidance as the preferred first‑line treatment for diarrhoeal dehydration.

The explainer notes that many pharmacies in Bali are familiar with treating traveller’s diarrhoea complaints and commonly stock products such as activated charcoal tablets sold under the brand Norit. It adds that antibiotics should be used only when necessary and on a doctor’s prescription, in line with international recommendations to reserve antimicrobial treatment for moderate or severe cases.

Symptoms described in the ministry’s article include abdominal cramps, bloating, diarrhoea, nausea, vomiting, mild fever and weakness related to dehydration. The timing and severity of symptoms can vary depending on the causative organism, dose of exposure and individual health status. Overseas guidance advises travellers to seek professional medical care if they experience high fever, blood in the stool, persistent vomiting, signs of significant dehydration or diarrhoea that does not improve over several days.

Checklist for visitors

Based on the Health Ministry explainer and international travel health advice, visitors to Bali can reduce their risk of Bali belly by following these measures:

• Drink sealed bottled water or properly treated water; avoid untreated tap water.
• Use safe water even when brushing teeth.
• Avoid ice if the water source is uncertain.
• Choose food that is thoroughly cooked and served hot.
• Peel fruit personally; avoid raw salads and unpeeled fruit washed in tap water.
• Clean hands with soap and water or alcohol‑based sanitiser before eating.

These steps cannot guarantee that travellers will avoid illness, because Bali belly can be caused by a range of bacteria, viruses and parasites. However, health authorities and travel medicine experts say that careful attention to food, water and hygiene substantially reduces the likelihood and severity of traveller’s diarrhoea.

Sources

• Kementerian Kesehatan RI – Direktorat Jenderal Kesehatan Lanjutan
• Freely – Bali belly guide: symptoms, treatment and how to avoid it
• The Lombok Journal – How to avoid the dreaded Bali belly
• US Pharmacist – Approach to Treatment and Prevention of Traveler’s Diarrhea
• Gale – How to Avoid Food Poisoning on Vacation: What Works
• University of Kentucky – Food Safety for Travelers Abroad
• Cleveland Clinic Journal of Medicine – Review on travellers’ diarrhoea (PDF)
• Centers for Disease Control and Prevention – Travelers’ Diarrhea (Yellow Book)
• Encyclopedia.com – CDC’s International Travelers’ Health Information: Safe Food and Water