Bali Health & Vaccinations — Medical Guide for Travellers

No vaccinations are legally required to enter Bali (unless you are arriving from a yellow fever endemic country), but several are strongly recommended. Ensure your routine vaccinations are up to date: measles-mumps-rubella (MMR), diphtheria-tetanus-pertussis, varicella, and your annual flu shot. Hepatitis A is highly recommended as it is transmitted through contaminated food and water. Hepatitis B is recommended for longer stays or if you might need medical treatment. Typhoid is recommended as it is food and water-borne. Rabies vaccination is worth considering if you plan extended rural travel or animal interactions — Bali has stray dogs and temple monkeys. Japanese Encephalitis may be recommended for stays over one month in rural areas. Consult your travel doctor 6–8 weeks before departure, as some vaccinations require multiple doses over several weeks.

Bali Belly (travellers' diarrhoea) is the most common health issue affecting visitors, with 30–50% of travellers experiencing some degree of digestive upset. It is caused by exposure to unfamiliar bacteria in food and water — not necessarily from 'bad' food, but from bacteria your gut has not encountered before. Prevention strategies include drinking only sealed bottled water, avoiding ice at very basic establishments (upscale restaurants use filtered ice safely), eating freshly cooked hot food rather than room-temperature buffets, washing hands frequently with soap, and peeling fruit yourself rather than eating pre-cut fruit from street vendors. If you do get Bali Belly, the treatment is simple: oral rehydration salts, plenty of clear fluids, bland food (plain rice, bananas, toast), and rest. Most cases resolve within 24–48 hours. If symptoms include high fever, blood in stool, or persist beyond 3 days, seek medical attention immediately.

Dengue fever is the primary mosquito-borne risk in Bali, transmitted by Aedes mosquitoes that bite during daytime, especially at dawn and dusk. Symptoms include high fever, severe headache, joint and muscle pain, and rash. There is no specific treatment — medical care focuses on managing symptoms and preventing complications. Prevention is your best defence: use DEET-based insect repellent (30–50% concentration), wear light-coloured long sleeves and trousers at dawn and dusk, sleep under mosquito nets if your accommodation does not have screens or air conditioning, and eliminate standing water near your accommodation. Malaria risk in Bali itself is very low and antimalarial medication is generally not recommended. However, if you are travelling to remote Indonesian islands (Flores, Sumba, Papua), consult your travel doctor about antimalarials for those specific destinations.

Bali sits just 8 degrees south of the equator, which means UV radiation is intense year-round — even on cloudy or overcast days, UV index regularly reaches extreme levels. Apply SPF 50+ sunscreen every 2 hours, especially after swimming. Wear a hat and UV-protective sunglasses. Seek shade during peak UV hours (10am–2pm). Drink at least 2–3 litres of water per day, more if you are active. Symptoms of heat exhaustion include dizziness, nausea, headache, and excessive sweating — if you experience these, move to a cool shaded area, drink water with electrolytes, and rest. Heatstroke is a medical emergency characterised by confusion, hot dry skin, and loss of consciousness — call emergency services immediately.

Bali has several international-standard medical facilities that cater to tourists. BIMC Hospital has two locations (Kuta and Nusa Dua) with 24-hour emergency departments, English-speaking doctors, and the ability to coordinate directly with international insurance providers. Siloam Hospital in Denpasar is a large modern hospital with specialist departments. Kasih Ibu Hospital in Denpasar is well-regarded for general care. For minor issues, pharmacies (apotek) are found throughout tourist areas and pharmacists can recommend and sell many medications without prescription, including antibiotics. For dental emergencies, Bali 911 Dental Clinic in Denpasar offers tourist-focused dental care. Always keep your travel insurance details accessible, as hospitals will typically require insurance confirmation or a cash deposit before treatment.