Anxiety is a normal, healthy response for the human body. But when it interferes with daily life it can become a disorder. We investigate anxiety's symptoms and biochemistry to learn how it can become irrational... and how you treat it.

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SOURCES:

http://www.howstuffworks.com/howanxi...

https://socialanxietyinstitute.org/so...

http://www.ncbi.nlm.nih.gov/books/NBK...

http://www.livestrong.com/article/181...

http://www.nationalanxietyfoundation....

http://www.adaa.org/understandinganx...

http://www.adaa.org/aboutadaa/press...