If you are planning to visit Nepal, then insurance should be your first priority to consider. If you do not have insurance, then there may not be financial aid for your sudden health problems. So if you are going to Nepal for trekking, then you should have travel trekking insurance. The routes in the Himalayan regions of Nepal are of very high altitude, which may cause high-altitude sickness, food poisoning and hypothermia.
If any of the above problems happen to you at 4500 feet up a mountain, then obviously you may not want to stay there for a night or more. And since the mountainous and hilly terrains can be major obstacles to reach Kathmandu city, you may need helicopter rescue as well.
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