Most people pack their bags before they think about their health. That’s backwards.

What Can Actually Go Wrong

For some destinations, the health preparation really is minimal — extra sunscreen, maybe some rehydration sachets. But other trips carry real biological stakes: viruses, bacteria, and parasites that don’t care how carefully you’ve planned your itinerary. Getting seriously ill in a country with limited medical infrastructure, or while hours from any hospital, changes a trip’s character entirely. And beyond illness, there are regulatory complications — some countries require documented proof of specific vaccinations just to cross the border. Skipping the health prep doesn’t mean nothing will happen. It means you’ve decided to find out.

The starting point is the CDC’s Travelers’ Health site, which catalogs health risks, vaccine recommendations, and entry requirements by country. It’s worth spending time there before any international trip, not just the exotic-sounding ones. The measles-mumps-rubella vaccine, for instance, is recommended for travel to virtually anywhere — not because of some theoretical risk, but because measles is actively rising globally. The CDC notes that most people who bring measles into the United States are unvaccinated American residents who contracted it while traveling internationally. That’s not a distant public health statistic. That’s a returning tourist on a flight home.

Destination-specific risks catch people off guard more than the obvious ones do. If you’re planning significant outdoor time in parts of Austria, a tick-borne encephalitis vaccine is recommended. Pregnant travelers are advised to avoid Costa Rica because of Zika virus risk. These aren’t obscure edge cases — Austria is one of Europe’s most popular hiking destinations, and Costa Rica draws millions of visitors annually. The risks exist alongside the postcard scenery.

The right approach is to treat your medical preparation the same way you’d treat booking accommodation: do it early, do it properly, and don’t assume you already know what you need.

Finding the Right Medical Advice

A general practitioner is not always the right resource for travel health. Primary care providers may not be current on rapidly evolving international health situations, and many clinics don’t stock the full range of travel vaccines. The International Society of Travel Medicine maintains a clinic directory that helps travelers locate specialists near them — this is worth using rather than defaulting to whoever is most convenient.

Book a travel health consultation at least one to two months before departure. That window matters because some vaccines require multiple doses spread across several weeks, and there’s no shortcut for the immune system’s timeline. Walk in six days before your flight and you may be too late for full protection, regardless of how persuasively you explain your situation.

At a pre-safari consultation for Tanzania, the specifics that came up illustrate how granular this advice gets: a tetanus booster was recommended, instructions to avoid tap water and uncooked foods, a prescription for an antimalarial drug to take throughout the trip, and a reminder to carry proof of yellow fever vaccination — which is frequently required when traveling through Africa. None of that would have come up in a standard annual checkup.

The 2026 DRC Ebola outbreak is the kind of active health concern a travel medicine specialist will flag in a consultation and a general practitioner may not mention at all. The picture changes fast. Outbreaks emerge, regions shift status, documentation requirements update. A specialist tracks this as professional currency.

One financial note worth knowing: standard health insurance often doesn’t cover travel-related preventive care. HSA funds, however, can be used for these expenses. That includes vaccinations, antimalarial prescriptions, and the consultation itself. It won’t make the appointments free, but it makes them tax-advantaged.

Medications, Documentation, and the Details That Derail Trips

Pack enough of any regular medication to cover your full trip, then add extra days beyond your return date. Delays happen — weather, strikes, mechanical issues — and running out of a critical medication in a foreign country while waiting for a rebooked flight is a problem that’s entirely preventable. Getting that extra supply sometimes requires a call to your doctor for early refill authorization. Make that call well before you’re standing at the pharmacy counter two days before departure, hoping the pharmacist will make an exception.

Some countries have strict rules about which medications can be brought across the border and in what quantities. Certain drugs that are standard prescriptions in the United States are controlled substances or outright banned elsewhere. Carry medications in their original labeled containers, and for anything that might raise questions — particularly controlled substances, injectable medications, or large quantities of any drug — bring a letter from your prescribing doctor on official letterhead. That letter should state your name, the medication, the dosage, and the medical necessity. Customs officers in several countries will ask for it.

Keep your medication in your carry-on bag, not in checked luggage. Checked bags get delayed, lost, and occasionally sent to the wrong continent. The one time you need your medication most urgently is exactly when you can least afford it to be in a suitcase being tracked through a cargo hub in a different city.

Documentation for vaccines follows similar logic. A physical copy of your vaccination record matters in places where digital systems aren’t accepted or where connectivity fails at the wrong moment. Yellow fever vaccination certificates are required for entry into a number of African and South American countries, and the requirement isn’t flexible — being turned away at a land border or airport because a certificate is missing or expired is the kind of thing that happens to prepared-seeming travelers who left one detail unconfirmed.

A waterproof travel document holder costs under $20 and keeps vaccination records, prescription letters, and insurance documentation accessible and dry across whatever weather or chaos the trip produces.

The Logistics Most People Skip

Travel health insurance deserves separate attention from standard travel insurance. A policy that covers emergency medical evacuation matters significantly on remote trips — medical evacuation from a safari region or a mountain trekking zone can cost tens of thousands of dollars out of pocket. Some credit cards include travel medical coverage as a benefit, but the coverage limits and terms vary widely enough that it’s worth reading the actual policy document rather than assuming.

For long-haul flights, the risk of deep vein thrombosis is real and underappreciated. A travel medicine specialist can advise on appropriate compression socks, movement schedules during flight, and whether any individual medical factors warrant additional precautions. This is particularly relevant for anyone over 60, anyone who has had a previous clot, or anyone flying more than eight hours.

A basic travel health kit should include any prescription medications, rehydration salts, antidiarrheal medication, a broad-spectrum antibiotic if your doctor agrees it’s appropriate for your destination, high-SPF sunscreen, DEET-based insect repellent, and a digital thermometer. The insect repellent matters beyond comfort — mosquitoes transmit malaria, dengue, Zika, and yellow fever depending on the region, and DEET at 20–30% concentration is the CDC-recommended standard for protection.

The antimalarial drug category alone has multiple options — mefloquine, doxycycline, atovaquone-proguanil — each with different dosing schedules, side effect profiles, and suitability for specific regions. Atovaquone-proguanil (sold as Malarone) typically runs $5–$8 per tablet without insurance and requires a prescription. Which one is right depends on where you’re going and your individual medical history.

That decision, at minimum, is worth one appointment with someone who knows the difference.