Other components of anxiety states are panic disorder, obsessive disorder, and post-trauma stress disorder.
Anxiety is a vague uncomfortable feeling of fear, dread, or danger from an unknown cause.
Immediate Cause Activation of the body's defense mechanisms for fight or flight. Signs and Symptoms 1. Twitching or trembling, or feeling shaky. Sleepiness and restlessness. Shortness of breath or smothering sensations.