Understanding Your Stress Response

Stress is one of the most common human experiences, yet most of us have only a vague sense of what's actually happening when we feel it. Understanding the mechanics of the stress response — what triggers it, what it does to the body, and how to work with it rather than against it — can make a meaningful difference to how we navigate difficult moments.

The alarm system

At the centre of the stress response is the amygdala — a small, almond-shaped structure in the brain that acts as an alarm system. When it detects a potential threat (real or imagined), it triggers the hypothalamus to activate the sympathetic nervous system, releasing adrenaline and cortisol into the bloodstream.

This is the famous fight-or-flight response. Heart rate increases. Blood is redirected to the muscles. Digestion slows. The immune system is temporarily suppressed. All of this happens in milliseconds — long before the thinking brain has had a chance to assess whether the threat is real.

"Between stimulus and response there is a space. In that space is our power to choose our response." — Viktor Frankl

When the alarm won't switch off

The stress response evolved to handle acute, physical threats — a predator, a fall, a confrontation. It was never designed to run continuously. Yet modern life presents us with chronic stressors: financial pressure, relationship conflict, work demands, social comparison. The alarm stays on, and the body pays the price.

• Elevated cortisol disrupts sleep and immune function
• Chronic muscle tension leads to headaches and back pain
• Digestive issues including IBS are strongly linked to chronic stress
• Prolonged activation increases risk of cardiovascular disease
• Cognitive function — memory, focus, decision-making — is impaired

Working with the response

The good news is that the nervous system is responsive to intervention. Slow, deep breathing activates the vagus nerve and triggers the parasympathetic "rest and digest" system. Physical movement metabolises stress hormones. Social connection — particularly physical touch — releases oxytocin, which directly counteracts cortisol.

Cognitive reappraisal — consciously reframing a stressor as a challenge rather than a threat — has been shown to change the physiological stress response itself, not just how we feel about it. The body follows the mind, and the mind can be trained.