Cortisol is often referred to as the body’s primary stress hormone, playing a key role in how the body responds to pressure, challenge, and perceived threat. While it is essential for survival, ongoing elevation of cortisol can affect how the brain functions, particularly in areas related to thinking, communication, and emotional regulation. This article is the third installment in our neurochemistry blog series, building on our previous discussions about dopamine and serotonin. dopamine supports motivation and drive, and how serotonin contributes to mood regulation and overall wellbeing. Cortisol tells a different story—one about survival, stress, and why ‘thinking’ your way calmly often doesn’t work.
What Is Cortisol and What Does It Do?
Cortisol is a steroid hormone produced by the adrenal glands, small triangle-shaped organs that sit atop the kidneys. When the body senses threat or danger, a cascade of signals activates the hypothalamic-pituitary-adrenal (HPA) axis in the brain—the body’s stress response system. The pituitary gland sends signals to the adrenal glands, which then release cortisol into the bloodstream.
In appropriate amounts, cortisol serves vital functions. It manages how the body uses nutrients, regulates blood pressure, controls the sleep-wake cycle, and provides energy to handle genuine threats. Cortisol is, quite literally, nature’s built-in alarm system.
However, when cortisol levels remain chronically elevated it becomes harder to express thoughts clearly, make decisions, or stay calm under pressure. The brain moves into a state focused on survival and as a result it’s harder to think your way out to stress.
Why Your “Thinking” Brain Goes Offline
Here’s what happens physiologically when cortisol rises: the amygdala, the brain’s emotional control centre, takes over. Meanwhile, the prefrontal cortex—the thinking brain – responsible for language, decision-making, and rational thought—goes offline. This isn’t a choice. It’s an evolutionary survival mechanism.
When cortisol levels are high in the brain and blood, language function decreases noticeably. People struggle to find words, difficulty expressing thoughts becomes overwhelming, and complex reasoning feels impossible. This explains why someone in acute stress can’t “just calm down” or “think positively.” The neural pathways required for rational thinking have literally been shut down by the body’s stress response.
Signs of High Cortisol
When cortisol levels are elevated, both emotional and physical changes may appear.
Common signs include:
- Being on edge or constantly worried
- Getting easily upset or frustrated
- Overreacting to situations that wouldn’t normally trigger strong responses
- Defensive
- Difficulty concentrating or remembering information
- Changes in perspiration; stress makes body odour more pronounced
- Sleep disruption despite physical exhaustion
- Appetite changes
- Feeling jumpy
When cortisol stays elevated, the brain becomes worried and continues to scan for potential threats even when none are present.
Why You Can’t Think Your Way Out of High Cortisol
A common suggestion to stress is to “reframe your thoughts,” “think positively,” “relax and breathe slowly” these strategies often does not work in the moment of high stress.
When cortisol levels are high, the prefrontal cortex isn’t fully online. When the thinking part of the brain is less active, it becomes difficult to access reasoning or problem-solving skills. It’s like asking someone to solve a mathematical equation while their calculator is switched off. The ‘equipment’ simply isn’t operational.
In this situation, the body needs support first. The body’s nervous system can be reset through physical action – ‘bottom-up’ strategies (ie. movement, breathing, or grounding), regardless of what the conscious mind is attempting. You can create the conditions for your thinking brain to come back online.
Ways to Reduce Cortisol
To help lower cortisol, consider these approaches:
Dietary and Lifestyle Changes
Several straightforward changes can lower cortisol levels:
- Reduce sugar intake. High sugar consumption triggers cortisol release and perpetuates the stress cycle. Refrain from any sugary drinks or food
- Drink more water. Dehydration itself triggers a mild stress response. Adequate hydration supports nervous system regulation.
- Eliminate or reduce caffeine. Caffeine stimulates cortisol production and keeps the nervous system in a heightened state.
- Prioritise sleep. Sleep is when the body naturally lowers cortisol. Consistent, quality sleep is one of the most powerful cortisol-reducing tools available.
Create a Calming Environment
The environment can greatly influence stress levels. Avoid fluorescent lighting. Fluorescent lights elevate cortisol and increases stress perception. Switching to indirect lighting—lamps, natural light, soft illumination—creates a calming environment that supports lower cortisol levels.
Establish a Routine and Predictability
Consistent family routines and rituals help both children and adults feel safer, which naturally lowers cortisol.
Adjust Communication Style
For parents and those supporting others:
- Listen more, talk less. When someone is stressed, their need is to be heard, not advised. Active listening signals safety to the nervous system.
- Speak calmly and gently. The nervous system responds to vocal tone. Calm speech creates calm.
A Body-Based Technique: The TIPP Skill
One of the most effective ways to reduce cortisol quickly is through physical techniques. One of the well-known techniques is the TIPP skill, a Dialectical Behaviour Therapy (DBT) technique that rapidly reduces emotional distress by working directly with your body’s physiology.
How the TIPP skill works:
The technique involves two simultaneous actions:
- Apply a cold stimulus to the face. Submerge your face in a bowl of ice water (or apply an ice pack to the face, particularly around the eyes and nose) for approximately 15-30 seconds whilst holding the breath. Your body thinks you are ‘diving underwater’.
- Increase abdominal pressure. At the same time, while your face is in cold water, compress the abdomen by tightening the core muscles and holding your breath. This increases pressure on the internal organs.
Why It Helps
When cortisol is high, the brain is not especially responsive to logic or reasoning. The TIPP skill triggers the “dive reflex”. Heart rate drops, blood flow shifts to your essential organs, and the nervous system leaves panic mode. It’s not magic, just biology shifting the nervous system out of high alert.
Moving Forward
Cortisol isn’t the problem — it’s the body doing its job. However, if stress doesn’t turn off, everything stays on high alert. So rather than asking, “What’s wrong with me?” ask, “What does my body need right now?” Because when stress spikes, change has to start in the body, not the mind.
For parents and caregivers, this goes even deeper. Kids learn more from what we do than what we say. How we respond under pressure becomes their example. Staying calm and regulated shapes their own ability to cope.
You don’t have to erase stress entirely. Instead, focus on one small thing you can do right now to help your body feel safer. That’s how real change begins.
