The fight or flight response is the body’s natural reaction to stress or perceived danger. It is an automatic survival system designed to help people react quickly during threatening situations.
Although this response originally developed to protect humans from physical danger, it can also become activated during modern-day stress, anxiety, emotional pressure, or overwhelming situations. Many people experience the effects of the fight or flight response without fully realizing what is happening inside the body.
Understanding how this stress response works may help people become more aware of their physical and emotional reactions during stressful moments.
What Does “Fight or Flight” Mean?
The phrase “fight or flight” describes two common ways humans may respond to danger:
- Fight: preparing to confront a threat
- Flight: preparing to escape from a threat
In both situations, the body quickly shifts into a heightened state of alertness.
This response happens automatically. People do not consciously choose it. Instead, the brain and nervous system react rapidly to help protect the body.
How the Fight or Flight Response Works
When the brain detects a possible threat, it sends signals throughout the body to prepare for action.
This process involves the nervous system and stress hormones that help …