Anxiety is the most common mental health disorder in adults, and also one of the most misunderstood. Most people can recognize it when they feel it but would struggle to define it, distinguish it from fear or panic or worry, or explain exactly when it crosses from a normal human response into something worth addressing. Anxiety shows up in your body, your thoughts, and your behavior in ways that are not always obvious, and the line between healthy anxiety and the kind that quietly takes over your life is worth knowing before you assume you already have it figured out.