Sigmund freud proposed that, beginning in childhood, people repress intolerable impulses, ideas, and feelings, and that this submerged mental energy sometimes produces mystifying symptoms, most notably

Sigmund Freud proposed that, beginning in childhood, people repress intolerable impulses, ideas, and feelings, and that this submerged mental energy sometimes produces mystifying symptoms, most notably Anxiety.  

Explanation:

Anxiety is the psychological state of feeling fear, worry or nervousness about a sudden situation. Although anxiety is helpful in creating a consciousness about a situation and desire to improve upon it, people with anxiety disorder has problem of extreme worrying of situations in everyday life which is harmful for psychological, mental and social health. The root cause of anxiety disorder can be genetics, trauma faced in childhood or the parenting of overprotective parents where children might develop anxious disposition.