Examples of mental stress are high responsibility, long hours, perfectionism, anxiety, and worry. Present-day reasons for increased stress are: rapid and disturbing changes due to modern science and technology; education that creates a spirit of competition and rivalry; the great expansion of cities; the change in values and lifestyles; the break-up of family life and loss of faith and love in mutual relations. This stress or build-up of mental tension does not only result in a lack of peacefulness but causes many physical and mental diseases such as: high blood pressure, insomnia, indigestion, asthmatic ailments, peptic ulcers, heart attacks and even cancer. It lowers man's immunity to diseases and accelerates the process of ageing.