The three stages or phases in the general adaptation syndrome (GAS), described by Selye, are:

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Selye's general adaptation syndrome (GAS) involves three stages or phases; alarm, resistance, and exhaustion. In the alarm stage, the body reacts to a stressor with the fight or flight response. The resistance stage involves the body adapting to the stressor and attempting to restore balance. If the stressor persists, the body enters the exhaustion stage, in which its resources become depleted and it becomes susceptible to various diseases and illnesses.

The Three Stages or Phases in the General Adaptation Syndrome