Although the problem of increased stress starts at the individual or group level, it acquires global dimensions. Wars, hot or cold, are an outcome of tension, as are communal riots or ethnic strife. Political tension may result in nuclear war which, in turn, could cause world catastrophe. Almost every individual suffers from tension and a man under tension often disturbs others and spreads waves of peacelessness. Sustained or frequent states of tension make a person physically and mentally weak so that he is unable to face even the slightest opposition or the smallest problem.
Stress causes the brain to lose the ability to think, and worry can make the hippocampus shrink by half, with the shrinkage increasing as the stress lasts longer.