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Anxiety is the most common mental health disorder. According to the National Alliance on Mental Illness, about 19 percent of American adults have an anxiety disorder, and about 7 percent of children ages 3 to 17 have anxiety every year. I wrote this book to answer common questions about anxiety — what it is, what causes it, how it differs from everyday worry, and the treatment options available. This book is a reference, which means you don’t need to read the chapters in order from beginning to end and you don’t have to remember anything — there isn’t a test at the end of it. Within this book, you may note that some web addresses break across two lines of text. If you’re reading this book in print and want to visit one of these web pages, simply key in the web address exactly as it’s noted in the text, pretending as though the line break doesn’t exist. If you’re reading this as an e-book, you’ve got it easy — just click the web address to be taken directly to the web page.