Anxiety

It's one thing to be nervous (adrenaline can even help you power through, say, an interview). It's another to suffer sweat-inducing, heart-pounding anxiety -- for no apparent reason -- that makes eating, sleeping, working or enjoying life difficult. In addition to generalized anxiety disorder (GAD), learn about panic disorder, obsessive-compulsive disorder (OCD), post-traumatic stress disorder (PTSD) and phobias.

One of the most unsettling things about anxiety disorders is how they take over your mind and body. Along with relentless uneasiness can come emotional symptoms, such as dread, confusion or a desire to escape. The physical symptoms of anxiety are often especially troubling because they can mimic serious illness. Such symptoms include heart palpitations, chest pain, trouble breathing, dizziness and sweating.