Anxiety: What is it and Why do we have it.
Anxiety at its core, it is your body's natural response to stress. It is a feeling of fear, apprehension, or worry about what is to come (the future). While it can feel incredibly uncomfortable—causing a racing heart, shallow breathing, or a looping mind—it is actually a deeply hardwired survival mechanism.
Here is a breakdown of what anxiety actually is and the evolutionary reasons why we have it.
What Is Anxiety?
While fear is an emotional response to an immediate, present threat (like stepping into the street and seeing a car speeding toward you), anxiety is the anticipation of a future, perceived threat (like worrying about a presentation next week, or stressing over an unpredictable life transition).
When you experience anxiety, your brain's emotional command center—the amygdala—perceives danger and triggers the sympathetic nervous system. This unleashes a flood of hormones like cortisol and adrenaline, initiating the fight-or-flight-or-freeze response. This causes real, physical shifts:
Your heart rate increases to pump blood to your muscles.
Your breathing becomes shallow and fast to take in more oxygen.
Your digestive system slows down (causing that "butterflies" or nauseous feeling) because your body is diverting energy to survival rather than processing food.
Your mind hyper-focuses on the perceived threat, making it hard to think about anything else.
Why Do We Have It? (The Evolutionary Purpose)
We have anxiety because, from an evolutionary standpoint, it kept our ancestors alive. It is an adaptation designed to protect us from danger.
1. The Evolutionary "Smoke Detector"
In the days of early humans, environmental threats were physical and immediate—predators, hostile tribes, or environmental hazards.
Early humans who were completely relaxed and unbothered by rustling bushes were much more likely to be eaten by a saber-toothed tiger.
Early humans who had a healthy dose of anxiety—who assumed the rustling bush was a threat and got ready to run or fight—survived to pass on their genes.
Your brain operates like a smoke detector: it would rather sound a false alarm for burnt toast (anxiety over a harmless situation) than fail to sound the alarm during a real house fire.
2. The Modern Mismatch
The primary reason anxiety feels so overwhelming today is a mismatch between our ancient brains and modern society.
Our brains are still wired for immediate physical threats, but modern stressors are rarely things we can physically fight or run away from. Instead, our "smoke detectors" are set off by modern, abstract stressors:
Financial stress or business management
Social rejection or public speaking
Health worries or major life changes
When you worry about a heavy workload or a difficult conversation, your brain treats it with the exact same chemical urgency as a physical predator, leaving you with a surge of physical adrenaline that has nowhere to go.
3. Optima Optimization (Yerkes-Dodson Law)
In mild amounts, anxiety actually serves as a motivational tool. According to a psychological principle known as the Yerkes-Dodson Law, there is an optimal level of arousal/anxiety that improves performance.
Too little anxiety leads to apathy, lack of preparation, or carelessness.
A moderate amount of anxiety focuses your attention, keeps you sharp, prompts you to study for an exam, or helps you double-check important details.
Too much anxiety overloads the system, leading to performance drops, panic, or avoidance.
