With million of anti-anxiety pills flying off the shelves, there’s no question that America has a serious anxiety issue. Countless people are ailed by generalized and chronic anxiety, and feel nervous and worrisome all the time for no apparent reason.

Anxiety is so real, it can actually have very real and physical negative side effects on the worrier, such as increasing the risk of heart disease. 

But why? For what purpose does anxiety exist in humans? Actually, according to Science Show, there are plenty of good reasons to be nervous.

But like nearly all human relics of the past, the antiquated ‘flight or flight’ emotion of the sympathetic nervous system must be properly moderated. If not, it can, and often does, inflict emotional, and even physical, hurt