Anxiety disorders serious medical illnesses that involve intense feelings of fear, anxiety, worry or apprehension often associated with specific situations, events or objects. The physical symptoms that accompany these feelings include heart palpitations, trembling, dry mouth, dizziness, nausea and diarrhea.

There are different types of anxiety disorders, but all share the feelings of excessive fear and dread. Types of anxiety orders include panic disorder, obsessive compulsive disorder, post-tra...