Anxiety is an uneasy mental state concerning impending or anticipated ill. It is marked by apprehension, uneasiness, and foreboding from which the individual cannot escape; it is accompanied by a feeling of helplessness because the anxious person feels blocked, unable to find a solution for problems. The uneasy mental state characteristics of anxiety may in time become a generalized "free floating" anxiety in which children experience a mild state of fear in any situation, which is perceived as a potential threat. Though anxiety develops from fear and worry, it is distinguished from them in several respects. It is vaguer than fear unlike fear; it does not come from an existing situation, but from an anticipated one.Anxiety depends upon the ability to imagine something not present, so it develops later than fear; it is often found during the early school years and tends to increase during childhood, especially from the fourth to the sixth grades. It does not wane during puberty but becomes more intense. Whether it will wane later depends largely upon the environment in which pubescent live, the pressure put on them to achieve beyond their capacities, and many other conditions.