Cortisol is your body’s main stress hormone. When you feel stressed, fearful, or like you need extra energy, your body releases cortisol to help you respond.
It boosts energy, helps you wake up, and supports your body in challenging situations. Cortisol also plays a role in controlling blood sugar, blood pressure, and inflammation.1
Think of cortisol as your body’s alarm system manager — it helps you react when needed, then calms things down when the stress is over.
not necessarily. Cortisol naturally increases when you’re under pressure – during a busy week, after poor sleep, or when you’re unwell. In small bursts, this is helpful.
But when stress becomes constant and cortisol levels remain high, it can begin to affect things like your sleep quality, mood, blood sugar levels, weight, blood pressure, and immune system.
High cortisol can develop slowly, and early symptoms are often mistaken for everyday stress.
Because cortisol affects your body in so many different ways, elevated levels may appear where you least expect it.
Your cortisol levels may be high if you are experiencing any of the following:
© Patient/Heather Ainsworth
1. Weight gain
One of the most common symptoms of high cortisol levels is weight gain, especially around your stomach and face, which often causes a distinctive ‘cortisol face’. 2– Rounded, puffy appearance with increased fat under the cheeks and jaw.
2. Insomnia
High cortisol can disrupt your natural sleep-wake cycle, making it harder to fall or stay asleep.3
Some people feel “tired but exhausted” at night, meaning their body is tired but their brain refuses to work.
3. Increased anxiety or irritability
Because cortisol is your body’s primary stress hormone, elevated levels can increase feelings of anxiety, restlessness, or mood swings.4
When stress signals are turned on, it becomes difficult for your body and brain to shift into a calm, controlled state.
4. Feeling tired
Even though cortisol is associated with alertness, chronically high levels can eventually make you feel physically and mentally tired – as your body remains in a state of stress for long periods of time that is difficult to maintain.5
5. Frequent headaches
Prolonged levels of high cortisol may contribute to tension headaches or migraines in some people.6
Chronic stress can promote persistent muscle tension — especially in your neck and shoulders — and alter pain pathways in the brain, increasing the frequency or intensity of headaches.
6. Muscle weakness
High cortisol can break down muscle tissue over time, leading to reduced strength, especially in your upper arms and thighs.7
Chronically high cortisol promotes protein breakdown, which can gradually reduce muscle mass and make it harder to build or maintain strength.
7. Skin changes
Cortisol affects collagen production, which can cause changes in your skin such as thinner skin, bruising easily, slow healing of cuts and wounds, and pink or purple stretch marks – often on your stomach, thighs or breasts.1
8. Low libido
High cortisol can interfere with the production of sex hormones such as estrogen and testosterone, leading to reduced sexual desire in both men and women.8
When your body is in a state of stress for a prolonged period of time, it may shift resources away from reproductive functions.
9. High blood pressure
Cortisol plays an important role in controlling blood pressure. When levels remain high, it increases the chance of high blood pressure (hypertension).9
High cortisol levels can increase blood pressure by causing your body to retain salt and water, which causes blood vessels to constrict more easily and your arteries to become stiff.
10. Difficulty concentrating
When stress hormones like cortisol remain elevated for long periods of time, it can lead to brain fog, memory loss, and trouble concentrating.5
Chronic stress can disrupt communication between brain areas responsible for focus, learning and short-term memory.
Many symptoms of high cortisol are the same in men and women – but some differ due to hormonal differences.
Common symptoms include weight gain, fatigue, high blood pressure, high blood sugar, mood changes, muscle weakness and sleep problems.
However, women may experience irregular menstruation, acne or increased facial hair, while men may notice decreased libido, erectile dysfunction or low testosterone levels.
For most people, high cortisol is usually associated with:
However, persistently high cortisol can also be caused by a medical condition called Cushing’s syndrome.
If you think your cortisol levels are too high, testing is the only reliable way to confirm it. Because cortisol naturally fluctuates throughout the day, doctors often use specific times or multiple tests to get an accurate picture.
These tests may include:
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Blood cortisol test – usually taken in the morning.
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24 hour urine cortisol test.
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Late night salivary cortisol test.
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Dexamethasone suppression test.
Proper diagnosis is important because Treatment to reduce cortisol levels Depends on identification of the underlying cause.
Cortisol is an essential hormone that helps regulate stress, metabolism, blood pressure, and sleep. Short-term increases are normal and protective. However, chronically high levels can contribute to fatigue, weight gain, poor sleep, anxiety, high blood pressure, and immune suppression.
Most cases are linked to chronic stress or lifestyle factors, but in rare cases, underlying medical conditions such as Cushing’s syndrome may be the cause.
If your symptoms are getting worse, feeling intense, or you notice rapid weight gain or changes in your skin, you should see a doctor.
