If you are like most people, then you may not realise that anxiety is actually an adaptive response that is essential for your survival. Anxiety's job is to protect you from danger by alerting you that there is a threat such as if a car or truck is about to hit you. A part of the brain called the amygdala sets in motion a chain reaction that flushes your bodies with chemicals that make you feel shaky, sweaty, breathless, fearful, tense, nauseous, dizzy so that you pay attention to the impending danger. If anxiety felt 'nice', then you may not pay enough attention, such as when you ignore a hunger pain, and as a result you could bring about your demise. Therefore, anxiety is a vital human function that keeps you alive. However, some people may have a genetic vulnerability, personality traits and learned responses to stressful life events that may also trigger anxiety or make it worse when it is not really needed.