Most travelers don't think about insurance until something goes wrong.

Then they spend the rest of the trip, or the months after, dealing with the financial fallout of not having it.

The good news is that travel insurance is genuinely straightforward once you understand what it does and doesn't cover. The harder part is accepting that you need to think about it before anything goes wrong, not after.

Every traveler's situation is different. How much of your trip is prepaid and nonrefundable? Are you in good health? What's the value of your luggage? Are you visiting a region with governmental instability or unpredictable weather? What coverage do you already have through your home health insurance, homeowners or renters policy, and credit cards? The answers to these questions shape what kind of coverage makes sense for you.

Travel insurance generally covers five main areas: trip cancellation and interruption, medical emergencies, emergency evacuation, baggage, and flight insurance. Most providers sell these in combination rather than as individual pieces, so a standard comprehensive package will typically include most or all of them.

Trip cancellation coverage reimburses you for nonrefundable expenses when something outside your control forces you to cancel or cut short your trip. Common covered reasons include illness, death of a family member, job loss, natural disasters that make your destination uninhabitable, or your airline or tour operator going out of business.

If you've paid significantly upfront for organized tours, nonrefundable hotels, or a cruise, this coverage can protect a substantial amount of money.

Buy it as soon as you make your first trip payment. Policies purchased more than seven to twenty-one days after booking typically exclude coverage for pre-existing medical conditions, tour company bankruptcies, and certain other events.

Medical coverage is where international travel insurance becomes genuinely critical. Most domestic health plans offer little to no coverage outside your home country. Medicare provides essentially no international coverage. A routine doctor visit abroad is usually an out-of-pocket expense you'll get reimbursed for later. But a hospitalization, surgery, or extended care for a serious illness or injury can produce bills in the tens of thousands.

Hospitals in foreign countries typically require payment upfront and don't bill your home insurer directly, so you'll need to pay first, then file for reimbursement.

Emergency evacuation coverage handles the cost of getting you to appropriate medical care. In remote locations or severe situations, this can mean a medically equipped private aircraft, which can cost several hundred thousand dollars. Standard health insurance at home almost never covers this. Even travel insurance evacuation benefits often cover getting you to the nearest appropriate hospital rather than returning you all the way home, so read the fine print on what "evacuation" actually means in each policy.

Most comprehensive travel insurance plans run about 5 to 10 percent of your total trip cost for emergency health and cancellation coverage. Age significantly affects pricing, with rates increasing for each decade over 50. Coverage for children under 18 is often included at low cost or free.

Before purchasing a policy, check what you may already have. Some credit cards include flight insurance or car rental coverage. Your homeowners or renters insurance may cover personal property theft anywhere in the world. Don't pay for coverage you already have, but also don't assume coverage exists without verifying the limits and conditions carefully.

Compare plans using aggregator tools that let you see multiple providers side by side. Avoid no-name companies found in search results. Stick to established providers, and always call the insurer directly with specific questions rather than relying on a travel agent's interpretation.

The right time to think about insurance is when you're booking your trip, not when your flight is delayed, your bag is missing, or you're in a hospital in a country where you don't speak the language. What part of your upcoming trip feels most vulnerable to the unexpected? That's probably where to start.