“Anxious” is a word with two faces. Sometimes it means eager excitement. “I’m anxious to see you!” we say, as we get off the phone with a friend who’s coming to visit. The other side of “anxious” is a bit darker: “I’m anxious about that test,” we say, when we’re worried about the results. We call the second meaning “anxiety,” and most of us experience it from time to time. In common usage, both meanings of “anxious” describe our responses to fleeting, time-limited events. But anxiety can also have a much more powerful grip on many of us. Without the right kind of attention, it can rule our lives. I’m a psychotherapist in private practice north of Boston, Massachusetts, and I’ve worked with many clients who have anxiety. In this, the first of two articles on a psychotherapist’s views on anxiety, I’ll describe what anxiety is and how you can tell whether you or someone close to you is suffering from it. In Part II, I’ll go into its causes and treatments, as well as the best ways to he