Stress, first described in the 1930s by endocrinologist Hans Selye, refers to the pressure we feel when faced with situations we perceive as unmanageable. Stressors — external factors like work or internal ones like self-doubt — trigger this response. Stress can be acute (short-term) or chronic (long-term), with chronic stress requiring prolonged physiological adaptation. Whether caused by minor annoyances or major life events, the body reacts similarly, preparing us to face challenges by activating the sympathetic nervous system. This response, while essential for immediate survival, can be detrimental when prolonged, leading to a host of physical and emotional issues.