Check with your health insurer to see what is covered before you go overseas. If you're concerned that your health insurance might not be enough on your trip, you might want to buy a travel insurance policy to fill in the gaps.
A major reason why travel insurance policies are important to you is that a majority of them offer medical coverage and emergency medical evacuation coverage; two things which some general policies do not cover. Another useful tip is that most of them also cover trip-cancellation or interruption coverage, so if you get sick and can't make your flight, you are covered!