Food Poisoning in Thailand: What to Do, Where to Get Help, and How to Recover

Traveller's diarrhoea and food poisoning affect an estimated 30–50% of visitors to Thailand at some point in a trip, making it by far the most common health complaint. Most cases are caused by E. coli bacteria from contaminated food or water, resolve within 2–4 days, and do not require medical treatment. Key priorities: hydration and electrolyte replacement. Thai pharmacies (look for the green cross symbol) sell oral rehydration salts (ORS) cheaply and without prescription — ask for ผงเกลือแร่ (phong klue rae). Coconut water is an excellent natural alternative. For adults who are otherwise healthy, antibiotic treatment is not necessary for most cases. Imodium (loperamide) slows diarrhoea and is useful for travel days but does not treat the underlying infection. Common culprits: ice made from contaminated water (less common at reputable establishments than it used to be); raw shellfish and raw seafood; mayonnaise-based dishes left in warm temperatures; buffet food that has been sitting out. The safest street food rule: choose stalls with high turnover, food cooked fresh in front of you, and avoid anything that looks like it has been sitting in the heat for hours. Seek medical attention if: you have a high fever (above 38.5°C/101.3°F); you see blood in your stool; symptoms persist beyond 72 hours; you cannot keep any fluids down for more than 12 hours; or if you suspect food poisoning from shellfish or mushrooms (which can indicate more serious toxins). Bangkok's pharmacies are staffed by qualified pharmacists and can advise on over-the-counter treatments without a consultation fee. Hospitals charge a consultation fee of approximately 500–1,000 THB for a GP visit.