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The terms anxiety and stress are often used interchangeably, although stress includes anger and frustration, while anxiety is typically worry and unease.
WSJ: Anxiety Can Bring Out the Best
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People with anxiety disorders feel excessive or irrational worry and can have anxiety-related physical symptoms, such as fatigue, headaches, trembling, sweating, panic, and nausea.
CNN: Study: Anxiety in youth linked to heart attacks later on
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The disorders run the gamut from panic attacks and specific phobias to obsessive-compulsive disorder, post-traumatic stress disorder and generalized anxiety disorder, a random kind of worry described as free-floating and relentless.
WSJ: Anxiety Can Bring Out the Best