It is a familiar feeling for some of us.

Your body just feels tense or restless.

Maybe your mind starts racing or you have trouble sleeping.

For some, it is a low humming in the back of your mind that simply won't quit.

It's anxiety.

About 40 million people in the United States have some sort of anxiety disorder.

That's according to the Cleveland Clinic, that's roughly

one out of ten people.

And that doesn't even account for the non-clinical lower-grade anxiety that almost all of us

experience at some point in our lives.

Anxiety is this simple definition of that feeling of fear or worry that comes in situations of uncertainty.

That's my simplistic definition of everyday anxiety.

That's Wendy Suzuki. She's a professor of neuroscience at New York University

and she's also author of the book Good Anxiety. On the one hand Professor

Suzuki points out that it makes sense that so many of us feel anxious every once in a while.

There's a lot in the news and sometimes in our lives to be anxious about.

But at the same time, Suzuki also thinks anxiety gets a bad name.

In fact, she calls anxiety the most misunderstood emotion.

The general feeling is, I just want to get rid of it and the misunderstanding is that it is valuable.

It's a warning system that we all need.

It is a tool that helps us figure out what we hold dear.

If we don't have that, I think something important will be taken away from our lives.

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