High cortisol: symptoms of chronic stress

You lie wide awake at three in the morning, your head spinning, and during the day you drag yourself from coffee to coffee. You put it down to a busy period, while your body may have been running at top speed for months. That is exactly the treacherous thing about chronic stress: you get used to it, until it piles up in symptoms.

My position: cortisol is the most misunderstood hormone in the self-test world. One morning draw does not prove a burnout, and a "normal" value does not rule out long-term overload. Cortisol is a clue in a bigger story, not a stamp.

Cortisol is your main stress hormone, and with long-term stress its pattern can become disrupted. This is the overview article of our cortisol and stress cluster. Below you will read what cortisol does, which seven signals can fit high cortisol, why chronic stress is different from a peak moment, and when a blood value can give direction.

What does cortisol do in your body?

Cortisol is a hormone your adrenals make, and it regulates your energy, blood sugar, blood pressure and your response to stress, among other things. It normally follows a fixed daily rhythm: high in the morning to get you going, low in the evening so you can settle down. In healthy people that rhythm is stable.

A short cortisol peak is actually useful. It helps you react sharply and alertly when something is asked of you. It becomes different when the peak no longer subsides. With ongoing stress the system that regulates cortisol, the so-called HPA axis, can become disrupted, flattening your daily rhythm. This seems to play a role in many of the symptoms people with long-term stress experience.

What are the symptoms of high cortisol?

The symptoms of long-term high cortisol are often vague and overlap with other causes. Yet there is a pattern: it usually revolves around sleep, mood, weight and energy. Not everyone has all of it, and the severity varies widely.

• Difficulty falling asleep or lying awake in the middle of the night with a restless mind
• Irritability, brooding or a short fuse
• Daytime fatigue, while in the evening you feel wired
• An increase in belly fat, sometimes despite the same lifestyle
• Strong cravings for sweet or salty, especially late in the day
• Catching colds more often or recovering longer after an infection
• An irregular period or more trouble with your cycle

Many of these symptoms also fit other causes, such as a thyroid problem, anaemia or menopause. That is exactly why a symptom alone says little. Unsure whether your fatigue comes from stress or something else? Also read which blood values to test for fatigue.

What is the difference between acute and chronic stress?

Acute stress is a short response to a trigger: a deadline, a near-accident, a tense conversation. Your cortisol peaks, you perform, and then it subsides again. That is healthy and even useful.

Chronic stress is different. Here the pressure keeps up for weeks to months, without enough recovery in between. The body gets no chance to return to rest.

According to the NHG Guideline Overstrain and burnout, long-term overload can lead to symptoms that no longer pass on their own, such as persistent fatigue, concentration problems and a sense of losing control. The difference lies mainly in the duration and the recovery, not in a single hard moment.

How does cortisol influence your other hormones?

Cortisol does not stand alone. With ongoing stress it can also disrupt the balance of your sex hormones and your thyroid. That explains why stress and cycle symptoms often occur together.

• High cortisol can put pressure on the production of progesterone and estrogen, which can make the cycle more irregular
• The ratio between cortisol and DHEA-S, another adrenal hormone, seems to say something about how your body handles long-term stress
• Stress also seems able to influence thyroid function, although that link is complex

Because these hormones influence each other, one single value rarely gives the whole picture. Want to understand how your adrenals and your hormone balance connect? Read our in-depth article on stress, adrenals and your hormone balance.

Why your cortisol changes during the day

Cortisol is not a fixed number you can read off at any moment. It follows a strong daily curve: shortly after waking it shoots up, in a peak called the cortisol awakening response, and then it falls throughout the day to a low point around midnight. That means a value at 8 am and the same value at 4 pm mean something completely different.

With long-term stress that curve can flatten: the morning peak becomes less high, or the evening value stays higher than it should. That flattening seems in research to relate to symptoms like poor sleep and persistent fatigue. It also explains why a single draw does not tell you everything. A normal morning value does not rule out a disrupted rhythm, which is why a doctor always looks at the value alongside your symptoms and the time of the draw.

What a cortisol value can and cannot tell you

A cortisol measurement in blood can help to detect extremes: a strongly elevated or strongly lowered value can give a doctor reason to look further for an underlying condition. For most people with stress symptoms, however, the value lies in a broad area that is hard to interpret. Cortisol does not prove a burnout, and a burnout does not always go together with an abnormal cortisol.

What a test can do is bring other causes of your symptoms into view. Fatigue, irritability and sleep problems also fit an underactive thyroid, anaemia or a deficiency of certain vitamins. By including those values, you avoid missing a treatable cause while focusing only on stress. So see a cortisol value as one line in a bigger story, not as the outcome in itself.

Stress or menopause: how do you tell the difference?

Symptoms of chronic stress and those of menopause strongly resemble each other: fatigue, poor sleep, mood swings and a changing cycle. That makes it hard to know where your symptoms come from. Sometimes both play at once.

Age sometimes gives a hint, but it offers no certainty. The Dutch Society of Obstetrics and Gynaecology (NVOG) points out that many women around menopause also have a busy life stage with work and care, which makes the two pictures blend together.

A blood test can help to separate the two, for example by looking at your sex hormones alongside your cortisol. We wrote a separate article about it: menopause or burnout, how to tell the difference.

Which blood values give insight with stress?

No single blood value proves chronic stress on its own, and stress is not a diagnosis you make purely on a number. Yet a few values can help to rule out other causes and sketch your hormone picture. The table below links a symptom to the value that usually says the most about it.

Cortisol is sensitive to the moment of the draw. It is usually highest in the early morning, so a morning draw (around 8 to 9 am) gives the most usable value. This table is a tool, not a diagnosis.

Want a targeted test? The Women's Hormones panel measures cortisol and your sex hormones among others in one draw, so you see the whole pattern instead of one single number. Then discuss an abnormal result with your GP.

What can you do yourself with chronic stress?

Stress cannot always be avoided, but you can often steer recovery. According to Thuisarts.nl and the NHG Guideline Overstrain and burnout, enough rest and reducing the load is the first step. Small, fixed moments of relaxation seem to have more effect than the occasional big break.

• A regular sleep rhythm, with fixed times to go to bed and get up
• Daily movement, preferably outdoors and not too late in the evening
• Consciously building in short breaks, even on busy days
• Reducing the load where you can, and asking for help when it becomes too much

Important: these steps do not replace medical care. If your symptoms persist or you feel increasingly affected, discuss it with your GP. With ongoing overload or burnout, guidance is often needed.

Sleep and cortisol: a vicious circle

Sleep and cortisol interlock, and with stress that can become a tricky circle. Normally your cortisol falls in the evening, so you settle down and fall asleep. If it stays higher than it should in the evening, you can feel as if your body is "on" while you are dead tired. That is a common complaint: tired but wired.

Then poor sleep in turn affects your cortisol the next day, so the circle sustains itself. The NHG and Thuisarts.nl stress that a regular sleep rhythm is one of the most important levers you can turn yourself. Fixed times, daylight in the morning and avoiding screens before sleep seem to have more effect than isolated measures. If breaking the circle does not work on your own, that is a good moment to involve your GP.

What do you bring to your GP?

If you go to your GP with stress symptoms, it helps to make your story concrete. A doctor can do more with a pattern than with "I have not felt well for a while". So note down a few things in advance, so you can steer the conversation.

• Since when your symptoms have been present and whether they began gradually or suddenly
• How your sleep, energy and mood run across the day
• Whether there was a clear trigger, such as work pressure, grief or a change at home
• Which medicines, contraception or supplements you use
• Any earlier results, such as a cortisol or thyroid value

With that information your GP can better judge whether a blood test is worthwhile, and if so, which values. A result is a tool in the conversation, not a replacement for it.

Testing stress and cortisol through Lunara: how it works

You do not need a referral from the GP for a hormone test. You order online, schedule an appointment at a draw location near you (there are 700+ locations in the Netherlands) and have blood drawn in the morning. You receive your result digitally, usually within a few working days.

Every result gets context from a registered doctor, per value. So you not only know what your cortisol is, but also what that can mean in your situation and whether a next step is logical. Want to understand more deeply how your adrenals work under stress? Read our article on stress, adrenals and your hormone balance.

Frequently asked questions

Can high cortisol be measured in blood?

Yes, cortisol can be measured in blood, but the moment of the draw weighs heavily. It is normally highest in the morning and lowest in the evening. A one-off value gives a snapshot; your doctor therefore always looks at the value together with your symptoms.

Does stress always give high cortisol?

Not always. With short-term stress cortisol can peak, but with long-term overload the daily rhythm can actually flatten. That is why a single value says little without context. A doctor assesses the picture as a whole.

When should I see the GP with stress symptoms?

If your symptoms persist longer than a few weeks, affect your daily functioning, or you feel increasingly listless, a conversation with your GP is worthwhile. With signs of overstrain or burnout, guidance is important.

Sources

• NHG Guideline Overstrain and burnout. Dutch College of General Practitioners. Available via richtlijnen.nhg.org.
• Thuisarts.nl. I have overstrain or a burnout. Dutch College of General Practitioners. Available via thuisarts.nl.
• Dutch Society of Obstetrics and Gynaecology (NVOG). Patient information on the menopause. Available via degynaecoloog.nl.
• Health Council of the Netherlands (Gezondheidsraad). Background on stress and health. Available via gezondheidsraad.nl.