What is anxiety?

What is anxiety ?Explain about it?

Anxiety : Means a ‘disturbed state’ of the body. It is an emotional reaction to some situation in which nervous system and glands play a crucial role. This reaction raises the level of human mind. In medical terminology, anxiety is defined as “apprehension of danger accompanied by restlessness and a feeling of oppression in the epigastrium.” It leads to variety of physiological reactions such as
• Increased heart rate
• Rapid shallow breathing
• Sweating
• Muscle tension
• Drying of mouth