If Anxiety is in My Brain, Why is My Heart Pounding?

A psychiatrist explains the neuroscience and physiology of fear

By Arash Javanbakht, Associate Professor of Psychiatry, Wayne State University

In the face of a perceived threat, your body often activates a fight-or-flight response. George Peters/DigitalVision Vectors via Getty Images

Heart in your throat. Butterflies in your stomach. Bad gut feeling. These are all phrases many people use to describe fear and anxiety. You have likely felt anxiety inside your chest or stomach, and your brain usually doesn’t hurt when you’re scared. Many cultures tie cowardice and bravery more to the heart or the guts than to the brain.

But science has traditionally seen the brain as the birthplace and processing site of fear and anxiety. Then why and how do you feel these emotions in other parts of your body?

I am a psychiatrist and neuroscientist who researches and treats fear and anxiety. In my book “Afraid,” I explain how fear works in the brain and the body and what too much anxiety does to the body. Research confirms that while emotions do originate in your brain, it’s your body that carries out the orders.

Fear and the brain

While your brain evolved to save you from a falling rock or speeding predator, the anxieties of modern life are often a lot more abstract. Fifty-thousand years ago, being rejected by your tribe could mean…