Anxiety is a term which is to describe different forms of a type of common mental disorder. It is characterised by excessive worrying, uneasiness, and fear about future uncertainties either based on real thoughts or imagination affects both physical and psychological health. Anxiety happens as a normal part of life. Anxiety can become abnormal if it interferes with your day-to-day activities. About 1 in 20 people have an anxiety disorder at any one time. There are various conditions (disorders) where anxiety is a main symptom.