Traveler's Diarrhea: Causes, Management and How to Prevent It
I'll explain clearly what it is, why it happens, how to treat it and—most importantly—how to avoid it on your next trips.
Traveler's diarrhea is common, but it can be prevented and treated effectively.
TL;DR (quick summary)
The essentials:
- • Traveler's diarrhea is caused by bacteria (80-90%), mainly E. coli, in contaminated water/food.
- • Most important: hydration with oral rehydration salts or safe fluids.
- • Antibiotics only in moderate/severe cases; chosen by destination (azithromycin in Asia, rifaximin in other areas).
Practical prevention:
- • Wash your hands, drink bottled water, avoid dubious ice.
- • Eat well-cooked, hot food; peel fruits yourself.
- • Avoid street food without hygiene, raw salads and undercooked seafood.
Traveler's diarrhea: causes, management and how to prevent it. It's one of the most frequent health problems when traveling to countries with fewer hygienic resources, and although it usually resolves on its own, it can ruin several days of vacation (or work). Here I explain what causes it, how to manage it and especially how to try to avoid it.
Quick index
What is traveler's diarrhea?
It's a diarrhea episode (three or more loose stools per day) that appears during a trip or shortly after, generally to countries with poorer sanitary conditions than your place of origin. It's almost always acquired through the fecal-oral route, by consuming contaminated water or food. 1
The good news is that it's usually self-limited (resolves on its own within a few days), but it can make you feel terrible if you don't know how to manage it.
Main causes: bacteria, viruses and parasites
Key fact:
In 80-90% of cases, traveler's diarrhea is of bacterial origin. 2
1. Bacteria (the leading cause)
The most common bacteria are:
- Enterotoxigenic E. coli (ETEC) and enteroaggregative (EAEC): the most common, especially in Latin America, Africa and Asia. 2
- Shigella: causes dysentery (bloody diarrhea) and fever.
- Salmonella: can also cause fever and general malaise.
- Campylobacter: especially common in Southeast Asia, with high resistance to quinolones. 3
2. Viruses
Viruses (like norovirus) explain a minority of cases, but can cause outbreaks on cruises, hotels or travel groups. 2
3. Parasites
Protozoa like Giardia or Cryptosporidium are less frequent but can cause more prolonged diarrhea. Parasites usually appear when diarrhea lasts more than a week. 4
Risk factors
You have higher risk if you travel to countries with low hygienic standards (Asia, Africa, Latin America), if you're a young child, have chronic diseases, take antacids (that lower stomach acidity) or if you indulge in "adventurous foods". 15
Risky foods: what to avoid (without ruining your experience)
High-risk foods and beverages
"Adventurous foods" are those with high contamination risk that many people consume out of curiosity or for local experience. Here's the complete list:
Foods better avoided
- Street food from stalls without visible hygiene. 67
- Raw or undercooked meats: carpaccio, steak tartare, rare burgers, undercooked satays. 1
- Raw or poorly cooked seafood/shellfish, especially from questionable waters. 1
- Buffets and reheated food that have been at room temperature for hours. 1
- Cold sauces, mayonnaise, creams and desserts with cream or eggs kept without refrigeration. 18
- Salads, leafy vegetables and raw produce difficult to wash properly. 18
- Fruits you can't peel yourself (already cut fruit or without peel). 1
Risky beverages
- Tap water and ice made with unsafe water. 16
- Fresh juices prepared with contaminated water or ice. 1
Practical summary
In simple terms, avoid anything that is: raw or undercooked, cold and prepared long ago, from stalls without visible hygiene and with water or ice not guaranteed.
Safest options: well-cooked food served very hot, fruits you peel yourself, and bottled or boiled beverages.
Symptoms and when to worry
Typical symptoms are diarrhea (three or more loose stools per day), abdominal cramps, nausea and, in some cases, vomiting. There may be mild fever.
Classification by severity
Current guidelines classify traveler's diarrhea according to its functional impact: 910
- Mild: digestive discomfort that doesn't limit your normal activities.
- Moderate: interferes with your activities (you have to stay at the hotel, change plans).
- Severe: incapacitating and/or with blood in stools (dysentery), high fever or significant dehydration.
Warning signs (seek medical attention)
- • Blood in stools
- • High fever (≥38.5°C / 101.3°F)
- • Severe dehydration (dizziness, confusion, little urine)
- • Diarrhea lasting more than 3-5 days without improvement
- • Very intense abdominal pain
Treatment: hydration, symptomatics and antibiotics
1. Hydration (most important)
The main goal is to prevent dehydration. In mild cases, safe fluids (bottled water, salty broths) are enough. In more intense cases, young children or elderly, use oral rehydration salts (ORS). 1112
Practical advice:
Avoid dairy, coffee and caffeinated beverages while you have active diarrhea; they can worsen fluid loss. 11
2. Symptomatic medications (loperamide and bismuth)
In mild cases without fever or blood, you can use:
- Loperamide (Imodium®): reduces the number of stools and cramps. 19
- Bismuth subsalicylate (Pepto-Bismol®): also helps with nausea. 9
⚠️ Do NOT use loperamide if you have:
- • High fever
- • Blood in stools
- • Dysentery symptoms
In these cases, loperamide can worsen the infection by retaining bacteria in the intestine. 1113
3. Antibiotics (when and which)
Antibiotics are indicated in moderate or severe cases, i.e., when diarrhea prevents you from doing your normal activities, there's high fever, blood in stools or very intense symptoms. 914
The antibiotic is chosen according to travel destination and local resistances:
| Destination / Situation | Antibiotic of choice | Duration |
|---|---|---|
| Many regions, non-invasive E. coli | Rifaximin 200 mg TID | 3 days |
| South/Southeast Asia (high quinolone resistance, Campylobacter) | Azithromycin 500 mg/day or 1 g single dose | 1-3 days |
| Latin America/Africa (predominant ETEC) | Fluoroquinolones (ciprofloxacin 500 mg BID or levofloxacin) | 1-3 days |
| Pregnancy / children | Azithromycin (medical evaluation) | As prescribed |
Important:
Guidelines recommend using antibiotics for the shortest time possible (often 1 day is sufficient) to reduce the risk of colonization by multidrug-resistant bacteria and intestinal microbiota alteration. 3913
If you want to learn more about antibiotic use and digestive side effects, I recommend reading about antibiotic-associated diarrhea and C. difficile infection.
Practical prevention (what really works)
Basic prevention measures
Although no measure is 100% effective, following these recommendations significantly reduces risk: 31617
1. Hand hygiene
Wash your hands frequently with soap and water, especially before eating and after using the bathroom. If water isn't available, use alcohol-based hand sanitizer.
2. Safe water
Drink only bottled water (check that the cap is sealed) or boiled water. Avoid ice if you don't know where it comes from. 16
3. Safe foods
- Eat well-cooked food served hot.
- Peel fruits yourself.
- Avoid raw salads, leafy vegetables and street food of dubious hygiene.
- Avoid raw or undercooked seafood.
4. Antibiotic prophylaxis (not routinely recommended)
Routine antibiotic prophylaxis is not recommended due to resistance risk and side effects. It's only considered in high-risk travelers (immunosuppressed, pregnant) or if diarrhea could be catastrophic (e.g., elite athletes). 31314
5. Probiotics: limited evidence
Some studies suggest that certain probiotics (Saccharomyces boulardii, Lactobacillus GG) may slightly reduce risk, but evidence isn't conclusive. If you're interested in this topic, I recommend reading about probiotics: patient guide.
The traveler's kit: what to pack
Many doctors recommend carrying a basic "kit" for self-treatment, especially if traveling to remote areas with limited healthcare access. 31118
Basic kit contents
- Oral rehydration salts (ORS): sachets to prepare with bottled water.
- Loperamide: for mild diarrhea without fever or blood.
- Bismuth subsalicylate (Pepto-Bismol®): for nausea and mild diarrhea.
- Prescribed antibiotic by your doctor according to destination (azithromycin, rifaximin or ciprofloxacin).
- Hand sanitizer for hand disinfection.
- Thermometer to monitor fever.
If you're traveling to a high-risk area, book an appointment so we can prepare your personalized travel kit.
Related articles (to learn more)
A personal touch (because traveling is also health)
I've had traveler's diarrhea in more than one country. The first thing you learn is that prevention works… when you apply it. The second, that carrying a basic kit gives you peace of mind (and can save several vacation days). And the third: hydration is more important than any pill.
FAQ: quick questions about traveler's diarrhea
What causes traveler's diarrhea?
In 80-90% of cases, bacteria such as enterotoxigenic E. coli, Shigella, Salmonella and Campylobacter, transmitted through contaminated water or food. Viruses (norovirus) and parasites can also cause it, though in smaller proportions. 2
When should I take antibiotics for traveler's diarrhea?
In moderate or severe cases: diarrhea that prevents you from doing your normal activities, with blood, high fever or very frequent. The antibiotic is chosen according to destination: azithromycin in Asia, rifaximin in many areas, or fluoroquinolones in Latin America/Africa. 914
How can I prevent traveler's diarrhea?
Wash your hands frequently, drink bottled or boiled water, avoid ice of doubtful origin, eat well-cooked and hot food, peel fruits yourself and avoid street food from stalls without visible hygiene. 316
Can I use loperamide if I have traveler's diarrhea?
Yes, in mild cases without fever or blood in stools. Loperamide helps reduce symptoms, but DO NOT use it if you have high fever, blood in stools or dysentery symptoms, as it may worsen the situation. 1113
How long does traveler's diarrhea last?
Usually between 3 and 5 days. Most cases resolve on their own with hydration. If it lasts more than a week, it's advisable to consult a doctor to rule out parasites or other causes.
Are probiotics useful for preventing traveler's diarrhea?
Evidence is limited. Some probiotics (Saccharomyces boulardii, Lactobacillus GG) may slightly reduce risk, but they're not as effective a prevention measure as hygiene and careful food selection.
References (clickable)
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- Mazur K, Machaj D, Mazur D, Asztabska A, Płaczek A. Treatment of traveler's diarrhea - clinical review. Journal of Education, Health and Sport. 2020;10:123-127. https://doi.org/10.12775/jehs.2020.10.05.012
- Steffen R, Hill D, DuPont H. Traveler's diarrhea: a clinical review. JAMA. 2015;313(1):71-80. https://doi.org/10.1001/jama.2014.17006
- De La Cabada Bauche J, DuPont H. New Developments in Traveler's Diarrhea. Gastroenterology & Hepatology. 2011;7(2):88-95.
- Erovichenkov A, Pshenichnaya N, Ishmukhametov A, Gorelov A, Akimkin V. Travelers' Diarrhea: Resolved and Unresolved Issues. Epidemiology and Vaccinal Prevention. 2021. https://doi.org/10.31631/2073-3046-2021-20-3-118-128
- Piyaphanee W, Wattanagoon Y, Silachamroon U, et al. Street food and travelers' diarrhea in Southeast Asia. Travel Medicine and Infectious Disease. 2011.
- Wahyuni S, Juffrie M, Rosalina I. Street food consumption and travelers' diarrhea. Food Safety Journal. 2019.
- Mattila L, Peltola H, Siitonen A, et al. Food-related causes of travelers' diarrhea. Clinical Infectious Diseases. 1995.
- Riddle MS, Connor BA, Beeching NJ, et al. Guidelines for the prevention and treatment of travelers' diarrhea: a graded expert panel report. Journal of Travel Medicine. 2017;24:S63-S80. https://doi.org/10.1093/jtm/tax026
- Giddings SL, Stevens AM, Leung DT. Traveler's Diarrhea. The Medical Clinics of North America. 2016;100(2):317-30. https://doi.org/10.1016/j.mcna.2015.08.017
- Diemert DJ. Prevention and Self-Treatment of Traveler's Diarrhea. Clinical Microbiology Reviews. 2006;19:583-594. https://doi.org/10.1128/cmr.00052-05
- Saito K, Vielemeyer O. Acute Traveler's Diarrhea: Initial Treatment. Current Treatment Options in Infectious Diseases. 2015;7:63-76. https://doi.org/10.1007/s40506-015-0039-3
- Schweitzer L, Singh B, Rupali P, Libman M. Emerging concepts in the diagnosis, treatment, and prevention of travelers' diarrhea. Current Opinion in Infectious Diseases. 2019. https://doi.org/10.1097/qco.0000000000000581
- Taylor DN, Hamer DH, Shlim DR. Medications for the prevention and treatment of travellers' diarrhea. Journal of Travel Medicine. 2017;24(suppl_1):S17-S22. https://doi.org/10.1093/jtm/taw097
- Tribble DR. Resistant pathogens as causes of traveller's diarrhea globally and impact(s) on treatment failure and recommendations. Journal of Travel Medicine. 2017;24(suppl_1):S6-S12. https://doi.org/10.1093/jtm/taw090
- Hill DR, Ryan ET. Management of travellers' diarrhoea. BMJ. 2008;337. https://doi.org/10.1136/bmj.a1746
- Al-Ghamdi H, Altokhy A, Jalalah N, et al. Prophylaxis, diagnosis, and treatment of Traveler's diarrhea. International Journal Of Community Medicine And Public Health. 2021. https://doi.org/10.18203/2394-6040.ijcmph20214438
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- Adler A, Ciccotti H, Trivitt S, Watson R, Riddle MS. What's new in travelers' diarrhea: Updates on epidemiology, diagnostics, treatment, and long-term consequences. Journal of Travel Medicine. 2021. https://doi.org/10.1093/jtm/taab099
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More information about digestive disorders
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