Anxiety is a feeling of worry, fear or uneasiness that can range in severity from mildly disconcerting to having a severe impact on daily living. Some amount of anxiety is normal and is experienced by most individuals at some point in their lives. However, people with anxiety disorder suffer from a more severe form of anxiety that can be difficult to control and even disabling in terms of carrying out regular day-to-day activities. Anxiety disorder is a mental ailment that leads to unnecessary anxiety over different activities and events.