During a panic attack, the body's fight or flight response is activated when there is no real danger. All the stress hormones and adrenaline that you need to fight an armed intruder or run for your life, are released at a time when there is no emergency. You are not actually in danger. So your body is left with all of this extra "fuel" but no battle to consume it. And you feel pretty rotten, anxious, and frazzled.
Why do some people panic and others don't? We're still not sure, but hopefully soon we can determine the liklihood of developing an anxiety disorder based on one's chemical make-up. But for now, we do know that heredity plays a big part. If it's in your family, you might want to do what you can to keep your environment as stress-free and prioritized as possible. You may find that throughout life's different stages, you are always dealing with some level of anxiety. Take heart, however, because with a little help, you can learn to manage it and lead a very productive and fulfilling life!