High cortisol symptoms

Cortisol is your body's primary stress hormone. Short-term spikes are normal and necessary — they help you respond to immediate challenges. But when cortisol stays elevated for weeks or months, the effects spread across almost every system in the body.

The difficulty is that many high cortisol symptoms are non-specific. They overlap with other conditions — thyroid problems, depression, iron deficiency, sleep disorders — which is why high cortisol is frequently missed or misattributed.

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Common symptoms of high cortisol

You may not experience all of these. Symptoms depend on how long cortisol has been elevated, by how much, and individual variation in cortisol sensitivity.

Physical symptoms

• Weight gain around the abdomen — sometimes called 'cortisol belly'. High cortisol promotes fat storage, particularly visceral fat around the trunk. Arms and legs may remain relatively slim.
• A rounded, puffy face — fluid retention and fat redistribution are common with sustained high cortisol.
• Fat deposits on the upper back or back of the neck — sometimes described as a 'buffalo hump'. A characteristic feature of Cushing's syndrome.
• Easy bruising — high cortisol weakens skin and blood vessel walls.
• Purple or pink stretch marks — particularly on the abdomen, thighs, and upper arms. More prominent and darker than typical stretch marks.
• Muscle weakness — especially in the upper arms and thighs. Cortisol breaks down muscle tissue.
• High blood pressure — cortisol raises blood pressure both directly and by affecting sodium retention.
• Recurrent infections — chronically elevated cortisol suppresses immune function, leaving you more vulnerable to illness and slower to recover.
• Skin problems — acne, poor healing, thinning skin.
• Irregular or absent periods — cortisol suppresses reproductive hormones.

Energy and sleep symptoms

• Persistent fatigue — despite sleeping, you feel unrefreshed. High cortisol disrupts deep sleep architecture.
• Difficulty falling or staying asleep — cortisol should be at its lowest in the evening. When it remains elevated, sleep onset is impaired and early morning waking is common.
• Energy crashes — particularly in the afternoon, often accompanied by cravings for sugar or carbohydrates.
• Feeling 'wired but tired' — a common description of chronic high cortisol: exhausted but unable to switch off.

Cognitive and emotional symptoms

• Brain fog — difficulty concentrating, poor working memory, mental sluggishness.
• Anxiety — cortisol activates the sympathetic nervous system. Chronic elevation keeps the body in a low-level threat response.
• Low mood or depression — sustained high cortisol is associated with reduced serotonin and dopamine activity.
• Irritability or emotional reactivity — reduced frustration tolerance and amplified stress responses.
• Memory problems — cortisol impairs hippocampal function, affecting both encoding and recall.
• Difficulty making decisions — related to prefrontal cortex impairment under chronic cortisol load.

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What causes high cortisol?

The most common cause is chronic psychological stress — sustained pressure from work, relationships, finances, or caregiving that doesn't resolve. But there are other causes worth being aware of:

• Cushing's syndrome — a medical condition caused by a tumour producing excess ACTH, or by long-term steroid medication. Requires medical investigation and treatment.
• Poor sleep and sleep deprivation — even mild chronic sleep restriction raises cortisol.
• Overtraining — excessive exercise without adequate recovery elevates cortisol chronically.
• Low calorie diets and fasting — caloric restriction raises cortisol as a survival response.
• Alcohol — regular alcohol consumption elevates cortisol and disrupts its diurnal rhythm.
• Certain medications — including corticosteroids (prednisolone, hydrocortisone) taken long-term.

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High cortisol vs. Cushing's syndrome — what's the difference?

Cushing's syndrome is a specific medical condition caused by prolonged, severe cortisol excess — typically due to a tumour on the pituitary or adrenal gland, or from long-term steroid use. It produces a characteristic cluster of symptoms including the rounded face, truncal obesity, purple stretch marks, and muscle weakness listed above.

Most people with high cortisol symptoms do not have Cushing's syndrome — they have stress-related or lifestyle-related cortisol elevation that doesn't reach clinical diagnostic thresholds. Both are worth identifying, but they require different responses. If you have a cluster of the more specific symptoms listed above (purple stretch marks, buffalo hump, pronounced truncal obesity), discuss Cushing's screening with your GP.

A hair cortisol test is useful in both situations — see our Cushing's cortisol test page for more detail on how hair testing helps with Cushing's investigation specifically.

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How to test for high cortisol

The challenge with testing cortisol for chronic elevation is that conventional blood tests are poorly suited to it. Cortisol fluctuates dramatically throughout the day and spikes in response to acute stress — including the stress of having blood drawn. A normal blood test result on a calm morning doesn't tell you whether your cortisol has been elevated for the past three months.

Hair cortisol testing solves this problem. As hair grows, it incorporates cortisol from the bloodstream — making the hair nearest the scalp a reliable record of your average cortisol over the previous three months. One sample, no timing requirements, not affected by today's stress levels.

It's the same principle as an HbA1c for blood sugar: a single measurement that reflects your sustained hormonal environment, not just one point in time.

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What to do if you think your cortisol is high

If you recognise several of the symptoms above and they've persisted for more than a few weeks:

1. Test accurately — a hair cortisol test gives you a reliable 3-month average. A single blood test is unlikely to be informative unless your GP is running it as part of a broader clinical investigation.
2. Discuss with your GP — particularly if you have symptoms that suggest Cushing's syndrome, or if symptoms are severe. Bring your test results to support the conversation.
3. Address the likely drivers — for most people, high cortisol is driven by sleep, stress, and lifestyle. Understanding your actual levels gives you a baseline to measure progress against.

If you are experiencing a suspected adrenal crisis (severe pain, vomiting, collapse, extreme weakness), seek emergency medical attention immediately.

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