There is a lot of uncertainty in world travel, and you never know when something bad might happen. You could get sick and need medical care. If you are into adventure sports, you may find yourself needing an emergency evacuation from a remote area. All of your possessions might get stolen from your hotel room or hostel. These things do happen and for a long-term trip, especially, you have a higher chance for a mishap. Even small trips should be considered for travel insurance as it is better to be safe than stuck with a bill that is out of your means to pay.