The Most Common Travel Health Mistakes I See as an ER Doctor
An ER physician shares the most common travel health mistakes that land international travelers in the emergency room, and how to avoid every one of them.
The Most Common Travel Health Mistakes I See as an ER Doctor
Every week, I treat travelers in the emergency room who are suffering from illnesses that were entirely preventable. As an emergency medicine physician and the founder of Wandr Health, I've seen hundreds of patients return from international trips with malaria they could have prevented with a $2-per-day pill, severe dehydration from traveler's diarrhea they could have treated with a pre-packed antibiotic, and altitude sickness that ruined once-in-a-lifetime treks. According to CDC data, roughly 2,000 malaria cases are diagnosed in the United States every year, and the vast majority occur in travelers who didn't take prophylaxis. These are not unlucky outcomes. They're predictable consequences of skipping basic travel health preparation.
Here are the seven most common mistakes I see, and exactly how to avoid them.
Mistake 1: Skipping Malaria Prophylaxis ("I'll Just Use Bug Spray")
This is the mistake that scares me the most. Malaria kills over 600,000 people worldwide each year, according to the World Health Organization. It is not a tropical inconvenience. It's a potentially fatal disease transmitted by mosquitoes that bite primarily between dusk and dawn.
I've treated travelers who spent thousands on safari lodges in Kenya or Tanzania but decided to skip a $60 course of antimalarials because they "read online that bug spray was enough." Insect repellent with DEET is an important layer of protection, but it is not a substitute for chemoprophylaxis (malaria prevention medication). The CDC recommends antimalarial drugs for travel to all malaria-endemic regions, and for good reason: only about 25% of U.S. residents diagnosed with malaria reported taking any form of prophylaxis, according to CDC surveillance data.
The two most commonly prescribed options, atovaquone-proguanil (Malarone) and doxycycline, are well-tolerated by most travelers and cost far less than a single night in an American emergency room. Through Wandr Health, you can get a prescription reviewed by a physician and medications shipped to your door before your trip, without the $100+ consultation fee of a traditional travel clinic.
How to avoid this mistake: If you're traveling to sub-Saharan Africa, South Asia, Southeast Asia, or parts of Central and South America, check whether you need malaria pills and start them before departure. Malarone requires 1-2 days of lead time; doxycycline requires 2 days.
Mistake 2: Ignoring Traveler's Diarrhea Risk ("My Stomach Can Handle Anything")
Traveler's diarrhea (TD) is the single most common illness affecting international travelers. A systematic review and meta-analysis published in the Journal of Travel Medicine found that the pooled incidence among short-term international adult travelers from high-income countries is 36.1%. For travelers to sub-Saharan Africa, attack rates range from 30% to 60% during a two-week trip, according to the CDC Yellow Book.
In my ER practice, I see travelers who've lost multiple days of a carefully planned itinerary to severe diarrhea and dehydration. Some end up needing IV fluids. The frustrating part? A pre-trip consultation could have equipped them with a standby antibiotic (ciprofloxacin or azithromycin) to begin treatment at the first sign of symptoms, potentially cutting illness duration from 3-5 days down to 24-48 hours.
Food and water precautions help (peel it, boil it, cook it, or forget it), but they're not foolproof. Even cautious travelers eating at reputable restaurants get TD. Having a physician-prescribed antibiotic in your bag is the difference between a minor inconvenience and a trip-ending illness.
How to avoid this mistake: Get a traveler's diarrhea treatment kit before you leave. Wandr Health can prescribe standby antibiotics along with your other travel medications, all shipped in one package.
Mistake 3: Not Preparing for Altitude ("It's Just a Hike")
Altitude sickness is one of the most underestimated risks in travel medicine. Research published in the journal High Altitude Medicine & Biology found that 75-77% of trekkers on Mount Kilimanjaro develop acute mountain sickness (AMS). A study of travelers to Cusco, Peru (elevation: 3,400 meters, the gateway to Machu Picchu) found that AMS adversely impacted the plans of roughly one in five visitors.
The symptoms are not subtle: pounding headache, nausea, vomiting, fatigue, and in severe cases, life-threatening pulmonary or cerebral edema. The tragedy is that acetazolamide (Diamox), a well-studied and inexpensive medication, can significantly reduce the incidence and severity of AMS when taken before ascent. Yet most of the altitude sickness patients I treat in the ER never considered taking it.
If your trip involves destinations above 2,500 meters (8,200 feet), including Cusco, Quito, La Paz, Kilimanjaro, or Everest Base Camp, you should discuss altitude sickness prevention with a physician before you go. The CDC recommends considering chemoprophylaxis whenever gradual acclimatization is not feasible, which describes most tourist itineraries.
How to avoid this mistake: Talk to a physician about acetazolamide for altitude sickness at least two weeks before a high-altitude trip. Wandr Health prescribes Diamox online with free shipping.
Mistake 4: Waiting Too Long to See a Doctor Before the Trip
I cannot overstate how often I meet travelers in the ER who tell me, "I meant to see a doctor before my trip, but I ran out of time." Some travel vaccines, like the yellow fever vaccine, require administration at least 10 days before travel to be considered valid for entry into certain countries. Hepatitis A and B vaccine series take weeks to months to complete. Antimalarials need to be started 1-2 days (Malarone) or 1-2 weeks (mefloquine) before entering a malaria zone.
The CDC recommends scheduling a pre-travel health consultation 4-6 weeks before departure. In my clinical experience, fewer than half of international travelers actually do this. The ones who don't are the patients I end up seeing in the emergency department.
Traditional travel clinics can make this worse: limited appointment availability, $100-$200 consultation fees, and the logistical hassle of scheduling around work and life. Online travel health platforms like Wandr Health exist specifically to eliminate these barriers. A physician reviews your trip details and health history within 24 hours, and your medications ship directly to you.
How to avoid this mistake: Start your pre-trip health preparation at least 4 weeks before departure. For trips requiring yellow fever vaccination or multi-dose vaccine series, plan 6-8 weeks ahead.
Mistake 5: Assuming Travel Insurance Is Optional
Here's a statistic that stops most travelers in their tracks: a medical air evacuation from a remote location can cost anywhere from $25,000 to over $250,000, according to the CDC Yellow Book. Medicare does not cover healthcare outside the United States. Most domestic health insurance plans provide limited or no international coverage.
I have seen patients arrive in my ER after being flown back from safari destinations, trekking routes, and island resorts with medical bills that exceeded the cost of their entire trip. Over 27% of all travel insurance claims stem from a medical emergency, and the average payout per medical claim is $1,816.
Travel health insurance is not an upsell or a luxury. It is a financial safety net that costs a fraction of what a single emergency room visit abroad would cost out of pocket.
How to avoid this mistake: Purchase travel health insurance before every international trip. Wandr Health offers travel insurance options alongside your prescriptions and vaccines so you can handle everything in one place.
Mistake 6: Not Checking Vaccine Requirements Until the Airport
Yellow fever vaccination is legally required for entry into certain countries in sub-Saharan Africa and South America. Without an International Certificate of Vaccination or Prophylaxis (the "yellow card"), you can be denied boarding or entry at the border. I've heard from travelers who discovered this requirement at the airport check-in counter and missed their flights.
Beyond legal requirements, the CDC recommends several vaccines for international travel that many travelers overlook: hepatitis A (recommended for nearly all developing-country destinations), typhoid (recommended for South Asia and parts of Africa), and Japanese encephalitis (recommended for extended stays in rural Southeast Asia). Routine vaccines like measles-mumps-rubella (MMR) should also be up to date, particularly given the global increase in measles cases that the CDC has documented in recent years.
How to avoid this mistake: Check the CDC destination pages for your specific country at least 6 weeks before travel. Book your vaccines through Wandr Health online, avoiding the hassle of calling multiple pharmacies to check availability.
Mistake 7: Packing the Wrong Medications (or None at All)
A surprising number of travelers pack ibuprofen and antacids and assume they're covered. In my experience, the travelers who fare best internationally are the ones who carry a small, physician-curated medication kit tailored to their specific destination. This might include:
- Antimalarials appropriate for their destination
- A standby antibiotic for traveler's diarrhea
- Acetazolamide for high-altitude destinations
- An anti-nausea medication for motion sickness (scopolamine patches or ondansetron)
- Oral rehydration salts
- Prescription-strength antihistamines if traveling to areas with high allergen or insect exposure
The contents of your travel health kit should be determined by where you're going, how long you'll be there, and what activities you've planned. A week on the beach in Cancun requires different preparation than a two-week trek through rural Nepal.
How to avoid this mistake: Complete Wandr Health's free pre-trip health check to get a personalized medication recommendation based on your destination, itinerary, and medical history. Get everything prescribed and shipped in one order, saving hundreds compared to traditional travel clinic fees.
The Pattern Behind Every Mistake
After years of treating preventable travel illnesses, the pattern is clear: most of these mistakes happen because travelers don't realize how easy preparation has become. They picture the old model (scheduling a travel clinic visit weeks out, paying $150+ for a consultation, driving to a specialty pharmacy, making separate calls for vaccines and insurance) and decide they'll just "wing it."
Modern travel health platforms have eliminated those barriers. A physician can review your trip and prescribe appropriate medications online in under 24 hours. Vaccines can be booked at a nearby pharmacy with a few clicks. Travel insurance can be bundled with your health prep. The entire process that used to take weeks, multiple appointments, and hundreds of extra dollars can now happen in one sitting from your couch.
The travelers I treat in the ER aren't reckless people. They're busy, well-meaning people who didn't know there was a simpler way to prepare. I founded Wandr Health specifically to close that gap.
FAQ
What is the most common travel health mistake?
The most common travel health mistake is failing to get a pre-travel health consultation. According to CDC data, fewer than half of international travelers seek medical advice before departure, even when traveling to high-risk destinations. This single oversight leads to missed vaccinations, lack of malaria prophylaxis, and no standby medications for common illnesses like traveler's diarrhea.
How far in advance should I prepare for international travel health?
The CDC recommends scheduling a pre-travel health consultation 4-6 weeks before departure. Some vaccines, like yellow fever and hepatitis B, require multiple weeks to take effect or complete their series. Antimalarials need to be started 1-2 days to 2 weeks before entering a malaria zone, depending on the medication.
Do I really need malaria pills for Africa?
Yes. The CDC recommends antimalarial prophylaxis for nearly all travel to sub-Saharan Africa. Only about 25% of U.S. residents diagnosed with malaria reported taking prophylaxis, which means the vast majority of cases are preventable. Atovaquone-proguanil (Malarone) and doxycycline are the two most commonly prescribed options.
What percentage of travelers get traveler's diarrhea?
A systematic review and meta-analysis found that 36.1% of short-term international travelers from high-income countries develop traveler's diarrhea. Rates are highest in sub-Saharan Africa, South Asia, and parts of Latin America, where attack rates can reach 30-60% during a two-week trip.
How common is altitude sickness at Machu Picchu?
Studies show that acute mountain sickness affects roughly one in five travelers to Cusco, Peru (elevation 3,400 meters), the primary gateway to Machu Picchu. On Mount Kilimanjaro, AMS incidence reaches 75-77% of trekkers. Acetazolamide (Diamox) can significantly reduce severity when taken before ascent.
Is travel insurance really necessary for international trips?
A medical evacuation from a remote international location can cost $25,000 to over $250,000, and most U.S. health insurance plans provide limited or no coverage abroad. Medicare does not cover international healthcare at all. Over 27% of travel insurance claims are for medical emergencies. For international travel, travel health insurance is strongly recommended.
Can I get travel medications online without visiting a travel clinic?
Yes. Online travel health platforms like Wandr Health allow you to complete a health questionnaire, have a physician review your trip details and medical history, and receive prescribed medications shipped directly to your door. This typically saves hundreds of dollars compared to in-person travel clinic consultations.
What should be in a travel health kit?
A well-prepared travel health kit should be tailored to your destination and may include antimalarials, a standby antibiotic for traveler's diarrhea, acetazolamide for altitude, anti-nausea medication, oral rehydration salts, insect repellent with DEET, and sunscreen. A physician consultation before travel ensures you carry the right medications for your specific itinerary.
About the Author
Alec Freling, MD is an emergency medicine physician and the founder of Wandr Health. With years of experience treating returned travelers in the emergency department, Dr. Alec Freling founded Wandr Health to make pre-trip health preparation accessible, affordable, and comprehensive. Wandr Health is a physician-founded platform offering travel prescriptions, vaccine booking, travel insurance, and pre-trip health consultations, all in one place.
Medical Disclaimer
This article is for informational purposes only and does not constitute medical advice. The information provided is based on CDC guidelines, WHO data, and peer-reviewed research current as of April 2026. Individual health needs vary. Consult a qualified healthcare provider before starting any medication or vaccine regimen. Wandr Health offers physician-reviewed travel health consultations for personalized recommendations.
Last updated: April 16, 2026
Sources:
- World Health Organization. "Malaria Fact Sheet." WHO, 2024. https://www.who.int/news-room/fact-sheets/detail/malaria
- Centers for Disease Control and Prevention. "Malaria Risk Assessment for Travelers." CDC, 2024. https://www.cdc.gov/malaria/hcp/risk-assessment/index.html
- Centers for Disease Control and Prevention. "Traveler's Diarrhea." CDC Yellow Book, 2026. https://www.cdc.gov/yellow-book/hcp/preparing-international-travelers/travelers-diarrhea.html
- Aw B, et al. "Incidence and risk factors for travellers' diarrhoea among short-term international adult travellers." J Travel Med. 2024. https://pubmed.ncbi.nlm.nih.gov/38224319/
- Davies AJ, et al. "Incidence and predictors of acute mountain sickness among trekkers on Mount Kilimanjaro." High Alt Med Biol. 2009. https://pubmed.ncbi.nlm.nih.gov/20919888/
- Salazar H, et al. "Acute mountain sickness impact among travelers to Cusco, Peru." J Travel Med. 2012. https://pubmed.ncbi.nlm.nih.gov/22776382/
- Centers for Disease Control and Prevention. "Travel Insurance, Travel Health Insurance, and Medical Evacuation Insurance." CDC Yellow Book, 2026. https://www.cdc.gov/yellow-book/hcp/health-care-abroad/travel-insurance.html
- Centers for Disease Control and Prevention. "The Pre-Travel Consultation." CDC Yellow Book, 2026. https://www.ncbi.nlm.nih.gov/books/NBK620920/
- Centers for Disease Control and Prevention. "High-Altitude Travel and Altitude Illness." CDC Yellow Book, 2026. https://www.cdc.gov/yellow-book/hcp/environmental-hazards-risks/high-altitude-travel-and-altitude-illness.html