Someone who is often over concerned and experiences apprehension, fear, panic, trembling, and jumpiness and/or apprehension may be suffering from Anxiety disorder. Anxiety may be described as an intense, debilitating and constant fear and it can be a part of other disorders, like: Panic disorder, Phobia, Obsessive-compulsive disorder (OCD), post-traumatic stress disorder (PTSD) and so forth. For an accurate diagnosis, this person should look for a psychiatrist, psychologist or counselor.