Stress is a normal physiological response to perceived threats or challenges in the environment. The document discusses stress and adaptation in three stages: alarm reaction, resistance, and exhaustion. It also covers types of stressors, effects of stressors on individuals, and coping mechanisms used during psychological adaptation to stress. Adaptation involves cognitive appraisal of stressors and use of coping resources and mechanisms to achieve either an adaptive or maladaptive response. Nursing interventions aim to reduce anxiety and promote stress management techniques.