Anxiety

 Anxiety is a neurological disorder that is opposite meanings of depression.

Anxiety is different from fear. Fear characterised emotional stress in response to threat. On the other hand anxiety is an emotional response to future anticipation. 

Anxiety in some case closely related to fear.  Fear of future threat may develop anxiety. It is a fight and flight response to future threat. 

Anxiety always accompanied with some nervous behavior. These are pacing back and forth and rumination and somatic complaint. 

Anxiety results by worry and uneasiness. It causes overactive behavior. 

Physical disorder accompanied with anxiety is fatigue, muscular tension, restlessness and concentration problem.

Within an appropriate time period someone faces a specific event anxiety may persist that is called anxiety disorder. Anxiety disorder is different from anxiety. Emotional stress persist more than 6 month characterised as anxiety disorder.

There have several types of anxiety 

Mathematical anxiety 

social anxiety 

Existential anxiety 

Somatic anxiety

Stage freight