In the modern growing world things becomes more complicated for adaptation of new way of life, one among the few may accept the environment and adapt, but for the once who could not adapt, it turns into psychological effect on human behaviour.One among the common result is called stress. To understand the actual cause of this we need to understand the concept of “GAS (General Adaptation Syndrome)”. The three-stage process that describes the physiological changes the body goes through when under stress. “Hans Selye”, a medical doctor and researcher, came up with the theory of GAS. During an experiment with lab rats at McGill University in Montreal, he observed a series of physiological changes in the rats after they were exposed to stressful events. Selye noticed that the body has been adapting to external stressors in terms of a biological pattern that is actually predictable, so that the internal balance, or homeostasis, would be restored and maintained. The most important part of this theory is that, even if one’s body wants to control or reduce the stress, it still has its limits. The limited supply of body’s energy to adapt to the stressful environment is even more compromised when the body is exposed to the stressor continuously. The main part of the GAS is the 3 stages which was proposed .The first stage is the alarm stage in this stage the stress is labelled as a threat so ,this makes the body to activate the flight or fight mechanism as a result the stress hormones are released so called as “adrenaline, noradrenaline and cortisol”. The second stage of GAS is called resistance stage. During this stage the respond of your body for the flight and fight mechanism is taken place which means the stress is reduced, next step is that you body’s defences become weaker, as it needs to allocate energy to the repair of damaged muscle tissues and lower the production of the stress hormones, but still the body should fight them continuously although not as stronger as it could during the initial response. Now during the third stage which is the last stage of GAS that is called as the exhaustion stage. In this stage the stress is prolonged for a long time, now the body loose energy for draining out the harmful impact of the stressor as a result this stage becomes to be the “stress overload” which is leading to the health problems in long run leading to stress and anxiety. Although the GAS model does not cover all aspects of the response to stress, it is useful for explaining the adaptive response to an acute training stimulus. The causes can be Peer Pressure, Academic Pressures and Socioeconomic Pressure. Prevention is better than cure, keep a positive attitude, talk to someone share your feeling, manage your time, eat healthy and make time for fun and relaxation like meditation.