In France the theme of the wolf disguised as a shepherd is more common. A number of recent CDs are titled A Wolf in Sheep's Clothing, although most are references to the idiom and the fable is not mentioned in the words of any of the songs
Anxiety caused by environmental and external factors. Environmental factors that are known to cause several types of anxiety include: 1  Trauma from events such as abuse, victimization, or the death of a loved one. 2  Stress in a personal relationship, marriage, friendship, and divorce. 3  Stress at work. 4  Stress from school.
It's well known that anxiety can cause heart palpitations, and it's believed that the main cause may be an over-awareness of one's own heart, combined with surges of adrenaline that may occur at random in those with anxiety. These types of palpitations often trigger panic attacks.