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Stress is the body's natural response to perceived threats or challenging situations. This reaction has deep evolutionary roots, as it was essential for survival. When our ancestors faced danger, such as a predator, the body triggered what is known as the "fight or flight" response, releasing hormones like adrenaline and cortisol, which increased heart rate, prepared muscles for action, and heightened awareness.

Today, we no longer face the same physical threats, but our bodies continue to react to modern stressors—like work issues, relationship problems, or financial pressures—in the same way. The nervous system cannot distinguish between a looming work deadline and an imminent physical danger, and it triggers the same physiological response.