Stress has become such a normal part of modern life that many people just accept it like the weather: we juggle work deadlines, family commitments, endless notifications, financial pressures and an expectation that we should somehow remain productive throughout it all. Hidden behind much of this is Cortisol, a hormone that quietly influences almost everything we do.
Cortisol often gets blamed for every unwanted symptom, from stubborn weight gain to sleepless nights, yet the reality is far more interesting. Without it, we would struggle to wake up, react to danger, think clearly under pressure or even maintain stable blood sugar levels. Cortisol is not the enemy, but problems can arise when our modern lifestyles keep our bodies producing it for far longer than nature ever intended.
Understanding how cortisol works, recognising when it is helping you, and knowing when it may be causing harm can make a remarkable difference to both your physical health and your mental wellbeing. Whether you are managing a demanding business, trying to enjoy a holiday, coping with family responsibilities or simply looking to feel more like yourself again, learning how to work with your body’s natural stress response rather than against it can pay enormous dividends.
What Is Cortisol?
Cortisol is a steroid hormone produced by your adrenal glands, two small glands that sit on top of your kidneys. Production of cortisol is controlled by a communication system known as the hypothalamic-pituitary-adrenal (HPA) axis – this system works rather like a chain of command. The hypothalamus in the brain detects stress or changing body conditions and signals the pituitary gland. The pituitary then instructs the adrenal glands to release cortisol into the bloodstream, where it travels throughout the body affecting multiple organs and systems.
Unlike adrenaline, which provides an almost immediate surge of energy, cortisol works over minutes and hours, helping the body maintain stability during periods of physical or emotional challenge.
Why Your Body Needs Cortisol
Despite its reputation, cortisol performs dozens of essential functions every single day; it helps to regulate blood sugar, supports blood pressure, controls metabolism, influences memory formation, reduces inflammation when required and assists the immune system in responding appropriately to infection or injury. It also plays an important role in determining when we feel awake and when we feel sleepy.
Healthy cortisol levels typically follow a daily rhythm. They are highest shortly after waking, helping us become alert and energetic, before gradually declining throughout the day so that the body is ready for sleep in the evening. However, when this rhythm becomes disrupted, problems often begin to appear.
Cortisol During Stress
Imagine walking into an important business meeting where millions of pounds are at stake, stepping onto a rugby pitch before a cup final, or suddenly hearing a smoke alarm in your home.
Your brain instantly assesses the situation and decides whether it represents a threat. If it does, cortisol production increases.
This prepares your body by:
- Releasing stored glucose for energy.
- Increasing alertness.
- Sharpening concentration.
- Raising blood pressure slightly.
- Making more energy available to muscles.
- Temporarily reducing processes that are not immediately essential, such as digestion and reproduction.
From an evolutionary perspective, this response helped our ancestors survive predators and other genuine dangers.
Today, however, the same biological system reacts to overflowing inboxes, difficult clients, financial worries, social media arguments and traffic jams.
Your body often cannot distinguish between a charging lion and a relentless stream of work emails.
The Positive Effects of Cortisol
When cortisol rises for short periods and then returns to normal, it delivers several important benefits. It helps athletes perform under pressure, enables emergency workers to respond rapidly in critical situations and allows business leaders to remain focused during major decisions. It supports memory during important events, mobilises energy when needed and helps the immune system regulate inflammation.
Without cortisol, human survival would be impossible, but the key is that the increase should be temporary rather than constant.
When Cortisol Becomes a Problem
The difficulties begin when stress becomes a permanent feature of daily life because if cortisol remains elevated for weeks, months or years, the body starts paying a price. Long-term elevated cortisol has been associated with:
- Difficulty sleeping.
- Weight gain, particularly around the abdomen.
- Reduced concentration.
- Poor memory.
- Increased anxiety.
- Low mood.
- Elevated blood pressure.
- Reduced immune function.
- Increased susceptibility to infections.
- Slower recovery from illness or injury.
- Fatigue despite feeling constantly busy.
It is important to note that these symptoms can have many different causes, and cortisol is only one possible factor. Anyone experiencing persistent symptoms should seek appropriate medical assessment rather than assuming cortisol is responsible.
Cortisol and Business Performance
Many professionals believe that constantly working longer hours makes them more productive, but the opposite is often true. Persistently elevated cortisol can impair decision-making, reduce creativity and narrow thinking. We become more reactive than strategic, more likely to make rushed decisions and less able to solve complex problems that require calm analysis. Leaders operating under prolonged stress may also become less patient, communicate less effectively and unintentionally create stress within their own teams.
Businesses often invest heavily in productivity software while overlooking one of the biggest influences on performance: the health of the people making the decisions. Managing stress is therefore not simply a wellbeing issue. It is also a business performance issue.
Cortisol in Personal Life
Relationships are often among the first areas affected by chronic stress. When cortisol remains high, people may become more irritable, less patient and more emotionally reactive. Small disagreements can escalate more quickly because the brain is already primed to detect threats. Parents may find themselves snapping at children over minor issues; couples may misunderstand each other’s intentions; friendships can suffer simply because people are mentally exhausted.
Recognising that stress changes how we communicate can sometimes prevent unnecessary conflict.
Why Holidays Feel So Different
Many people notice that they sleep better, laugh more and generally feel healthier within a few days of going on holiday and there is a good reason for this: when daily pressures are removed, cortisol production often begins returning towards its natural rhythm. Better sleep, more physical activity, time outdoors, reduced email traffic and increased social interaction all contribute to lowering the body’s stress response.
Some people even become unwell shortly after beginning a holiday, a phenomenon sometimes called “leisure sickness”. One theory suggests that the body’s constant state of alertness during prolonged stress relaxes once the pressure disappears, allowing symptoms that were previously suppressed to become more noticeable. Research into this phenomenon is ongoing. I often used to wonder why I would develop a cold on a Saturday morning…
Unfortunately, many people now take their work on holiday through laptops and smartphones, preventing the full psychological recovery that holidays are intended to provide, so do have a think. Sometimes we may feel obligated to work when on a break especially as a micro or small business owner and that’s understandable; try to set yourself specific times of the day so you are able to unwind inbetween.
Can You Measure Cortisol?
Yes; your GP can measure cortisol using blood, saliva or urine tests, depending on the clinical question being investigated. Testing is generally used when doctors suspect an underlying medical condition affecting cortisol production, such as adrenal disorders, rather than as a routine health check.
However, as cortisol naturally changes throughout the day, interpreting results requires careful timing and medical expertise.
Practical Ways to Keep Cortisol Healthy
The goal is not to eliminate cortisol. The goal is to help your body return to normal once stressful situations have passed; the following habits have consistently been associated with healthier stress regulation.
1. Prioritise Sleep: Poor sleep and elevated cortisol reinforce each other. Establishing regular sleeping patterns remains one of the most effective ways to support healthy hormone regulation.
2. Exercise Regularly: Moderate physical activity helps regulate stress hormones over time. Extremely intense training without sufficient recovery, however, can temporarily increase cortisol, making balance important.
3. Spend Time Outdoors: Exposure to natural environments has been associated with lower perceived stress and improvements in mood.
4. Eat Regularly: Highly restrictive eating patterns or frequently skipping meals may increase physiological stress for some people. Eating balanced meals supports stable energy levels throughout the day.
5. Build Recovery Into Your Working Day: The brain is not designed for eight continuous hours of intense concentration. Short breaks, standing up, walking briefly or changing tasks can all reduce mental fatigue.
6. Limit Constant Notifications: Many people remain in a low-level state of alert because phones, emails and messaging platforms continuously demand attention. Creating uninterrupted periods of focused work allows the nervous system occasional relief.
7. Maintain Social Connections: Supportive friendships and positive relationships provide measurable benefits during stressful periods and can help reduce perceived stress.
8. Practise Relaxation Techniques: Deep breathing exercises, mindfulness, meditation, yoga and similar practices have all shown benefits for many people by reducing activation of the body’s stress response.
9. Know When to Stop: One of the most valuable skills in both business and personal life is recognising when continuing to push harder is becoming counterproductive. Recovery is not laziness, but part of sustained performance.
The Bottom Line
Cortisol is neither good nor bad. It is simply one of the body’s most important survival tools. In healthy amounts, it keeps us alive, focused, energetic and resilient. When life’s pressures become relentless and recovery disappears, the same hormone that once protected us can gradually begin working against us. Rather than trying to eliminate stress entirely, the aim should be to create a lifestyle that allows periods of recovery to balance periods of challenge. Businesses that encourage healthier working practices, families that prioritise genuine downtime and individuals who understand their own stress responses are all likely to benefit from a healthier relationship with cortisol.
Modern life will probably never become stress free, but understanding how your body responds to stress gives you far greater control over how that stress affects your health, your relationships and your long-term wellbeing.
If you feel you need help, do reach out to us.
FAQs
What organ produces cortisol?
Cortisol is produced by the adrenal glands, which sit on top of each kidney. Its release is controlled by the hypothalamus and pituitary gland in the brain.
Is cortisol always harmful?
No. Cortisol is essential for life and plays a vital role in energy production, metabolism, immune regulation and helping the body respond to physical and emotional challenges.
What are the symptoms of high cortisol?
Possible symptoms include poor sleep, increased abdominal fat, fatigue, anxiety, reduced concentration, elevated blood pressure and a weakened immune response. These symptoms can also be caused by many other medical conditions.
Can holidays reduce cortisol?
Many people experience lower stress levels during holidays because they are removed from many everyday pressures, although individual experiences vary.
Does exercise lower cortisol?
Regular moderate exercise helps support healthy stress regulation over time, although intense exercise temporarily increases cortisol as part of the body’s normal adaptation process.
Can diet affect cortisol?
A balanced diet that supports stable energy levels may help the body regulate stress more effectively. Excessive alcohol intake, very poor sleep and chronic under-eating may contribute to increased physiological stress.
References
American Psychological Association. Stress effects on the body. https://www.apa.org
British Heart Foundation. Stress and your heart. https://www.bhf.org.uk
Cleveland Clinic. Cortisol: What It Is, Function, Symptoms & Levels. https://my.clevelandclinic.org
Harvard Health Publishing. Understanding the stress response. https://www.health.harvard.edu
Mayo Clinic. Chronic stress puts your health at risk. https://www.mayoclinic.org
National Health Service (NHS). Stress, anxiety and low mood. https://www.nhs.uk
Society for Endocrinology. Hormones: Cortisol. https://www.yourhormones.info
World Health Organization. Mental health and well-being. https://www.who.int
