Abnormal cortisol levels can disrupt your body’s ability to respond to stress, regulate metabolism, control blood pressure, and maintain overall health. Understanding the signs and causes of cortisol imbalances is essential for protecting your wellbeing.

Understanding Cortisol and Its Role in the Body

Cortisol is a steroid hormone produced by your adrenal glands, which are small glands that sit on top of each kidney. While many people think of cortisol as simply the “stress hormone,” it actually plays a much broader role in keeping your body functioning properly. This hormone acts as a chemical messenger that travels through your bloodstream to nearly every organ and tissue in your body.^[1]

Your body depends on cortisol for many essential daily functions. The hormone helps regulate how your body uses glucose (sugar) for energy, which is critical for maintaining steady blood sugar levels throughout the day. Cortisol also helps control inflammation in your body, keeping your immune system in balance. Additionally, it plays an important role in regulating your blood pressure and helping control your sleep-wake cycle, also known as your circadian rhythm.^[1]

When it comes to stress management, cortisol does indeed play a key role. Your body releases this hormone when you experience any type of stress, whether it’s short-term, long-lasting, or traumatic. During stressful moments, cortisol triggers the release of glucose from your liver, providing your body with quick energy to handle the situation. This is part of your body’s natural “fight or flight” response that helps you deal with perceived threats or challenges.^[1]

The production and release of cortisol is carefully controlled by an intricate system involving three key parts of your body: the hypothalamus in your brain, the pituitary gland at the base of your brain, and the adrenal glands on top of your kidneys. When cortisol levels in your blood drop, your hypothalamus releases corticotropin-releasing hormone (CRH), which signals your pituitary gland to produce adrenocorticotropic hormone (ACTH). This hormone then triggers your adrenal glands to make and release cortisol. This elaborate feedback system helps maintain steady cortisol levels, a process called homeostasis.^[1]

Epidemiology

Medical conditions involving abnormal cortisol levels are relatively uncommon in the general population. Having truly high or low cortisol levels is actually quite rare, according to medical experts.^[2] Most people experience normal fluctuations in cortisol throughout the day, with temporary spikes during stressful moments that don’t indicate a serious health problem.

Cushing syndrome, the condition caused by prolonged exposure to excessively high cortisol levels, affects approximately 40 to 70 people out of every 1 million individuals each year.^[16] Among those who develop Cushing syndrome, the majority are women. Roughly 70% of patients with this condition are female, while 30% are male.^[16] The condition most commonly affects adults between the ages of 25 and 50, though children and teenagers can also develop it.

When Cushing syndrome results from a tumor in the pituitary gland—a specific type called Cushing disease—it accounts for 70 to 80% of all cases in adults and about 60 to 70% of cases in children and adolescents.^[10] Tumors in the adrenal glands themselves are responsible for about 10% of Cushing syndrome cases, while tumors in other parts of the body that produce cortisol account for another 10%.^[10]

Primary adrenal insufficiency, also known as Addison disease, is even rarer than Cushing syndrome. This condition, where the adrenal glands don’t produce enough cortisol, affects approximately 1 in 8,000 people.^[6] Secondary adrenal insufficiency, which occurs when the pituitary gland doesn’t produce enough ACTH to stimulate cortisol production, is more common and present in around 1 in 3,000 individuals.^[20]

However, the most frequent cause of cortisol-related problems comes not from these rare diseases, but from medications. The use of glucocorticoid medications (such as prednisone) for treating inflammatory or immune-related conditions affects up to 2.5% of the population.^[20] These individuals can develop symptoms similar to naturally occurring cortisol disorders and are at risk for complications if their medication is stopped suddenly.

Causes

Abnormally high cortisol levels develop when your body is exposed to too much cortisol over an extended period. This condition, called hypercortisolism, has several possible causes. The most common cause is taking high doses of corticosteroid medications such as prednisone, prednisolone, or dexamethasone for treating conditions like asthma, autoimmune diseases, or chronic inflammation.^[1] These medications work similarly to natural cortisol in your body, and when taken for long periods, they can cause the same problems as naturally overproduced cortisol.

Tumors are another major cause of excessive cortisol production. A pituitary tumor—an abnormal growth in the pea-sized gland at the base of your brain—is the most common tumor-related cause, accounting for 70 to 80% of cases. When a tumor in the pituitary gland produces too much ACTH, it signals the adrenal glands to make excessive cortisol. This specific condition is called Cushing disease.^[10] Most pituitary tumors that cause this problem are benign, meaning they are not cancerous and don’t spread to other parts of the body.

Tumors in the adrenal glands themselves can also produce too much cortisol. These adrenal tumors may be benign growths called adenomas or, more rarely, cancerous growths. Adrenal tumors are responsible for about 10% of Cushing syndrome cases.^[10] In some cases, people develop bilateral adrenal hyperplasia, where both adrenal glands become enlarged and produce excess cortisol.

A less common but important cause involves ectopic tumors—cancers that develop in parts of the body other than the pituitary or adrenal glands but still produce ACTH or cortisol. These tumors, often found in the lungs, account for about 10% of Cushing syndrome cases.^[10]

Low cortisol levels have different underlying causes. Primary adrenal insufficiency, or Addison disease, occurs when the adrenal glands themselves are damaged and cannot produce enough cortisol. In developed countries, the most common cause of Addison disease is an autoimmune attack, where the body’s immune system mistakenly destroys the cells in the adrenal cortex that produce steroid hormones.^[20] Other causes of primary adrenal insufficiency include infections that damage the adrenal glands, certain genetic conditions, or bleeding into the adrenal glands.

Secondary adrenal insufficiency happens when the pituitary gland doesn’t produce enough ACTH to stimulate cortisol production. This can result from pituitary tumors, head injuries, surgical removal of the pituitary gland, or infiltrative diseases that affect the pituitary. Stopping long-term glucocorticoid medication suddenly is also a common cause of secondary adrenal insufficiency, as the prolonged medication use can suppress natural ACTH and cortisol production.^[20] Increasingly, doctors are recognizing that high-dose opioid pain medications can also suppress the hypothalamic-pituitary-adrenal axis and lead to low cortisol levels.^[20]

Risk Factors

Several factors can increase your likelihood of developing abnormal cortisol levels. One of the most significant risk factors is chronic stress. When you experience ongoing stress from work, relationships, financial difficulties, or other life challenges, your body continuously produces elevated cortisol. While temporary cortisol spikes during stressful moments are normal and healthy, prolonged stress keeps cortisol levels elevated for extended periods, which can lead to various health problems.^[2]

Long-term use of steroid medications is perhaps the most common risk factor for developing cortisol-related issues. If you take prednisone, prednisolone, or similar medications for conditions such as rheumatoid arthritis, inflammatory bowel disease, severe asthma, or lupus, you face an increased risk of developing symptoms similar to Cushing syndrome. Additionally, when you take these medications for extended periods, your adrenal glands may shrink and stop producing their own cortisol, putting you at risk for adrenal insufficiency if the medication is stopped abruptly.^[16]

Certain medical conditions increase your risk as well. Having obesity can affect cortisol levels and metabolism. Pregnancy causes natural changes in hormone production that can sometimes reveal underlying cortisol disorders. People with autoimmune diseases have a higher risk of developing autoimmune-related Addison disease, where the immune system attacks the adrenal glands.^[20]

Chronic sleep problems represent another important risk factor. Conditions such as obstructive sleep apnea, insomnia, or working night shifts can disrupt your body’s natural cortisol rhythm. Normally, cortisol levels should be highest in the morning and gradually decrease throughout the day, reaching their lowest point around midnight. When sleep patterns are disrupted, this natural rhythm can be thrown off, potentially contributing to cortisol imbalances.^[1]

Temperature extremes, whether very hot or very cold conditions, can stress the body and affect cortisol production. Infections and traumatic events also place significant demands on the body’s stress response system. People who have undergone radiation treatment to the brain or pituitary area face increased risk for developing secondary adrenal insufficiency due to potential damage to the pituitary gland.^[9]

Your age and gender can influence risk as well. Cushing syndrome most commonly affects adults between 25 and 50 years old, and women are more than twice as likely as men to develop the condition.^[16] Genetic factors also play a role in some cases, particularly in certain inherited conditions that affect adrenal gland function.

Symptoms

The symptoms of abnormal cortisol levels depend on whether you have too much or too little of this hormone. Because cortisol affects so many body systems, the signs can be varied and may develop gradually over time, making them easy to overlook or attribute to other causes.

Symptoms of High Cortisol (Hypercortisolism)

When your body has been exposed to too much cortisol for an extended period, you may experience significant physical changes. One of the most noticeable signs is weight gain, particularly in specific areas of your body. Many people develop a rounded, fuller face that’s sometimes called “moon face.” Fat tends to accumulate around your midsection—the stomach, chest, and back—while your arms and legs may remain relatively thin or even become thinner due to muscle weakness.^[3]

You might notice a fatty deposit developing between your shoulder blades, creating what doctors call a “buffalo hump.” Your skin may become thin and fragile, bruising easily even from minor bumps. Wide, pink or purple stretch marks often appear on your stomach, breasts, hips, thighs, and underarms. These marks are typically broader and more colorful than the stretch marks that come from pregnancy or normal weight changes.^[3]

Your skin may also develop acne or heal slowly when you get cuts or wounds. Some people develop high blood pressure that can be difficult to control with medication. Blood sugar levels may rise, potentially leading to prediabetes or type 2 diabetes. You might experience muscle weakness, particularly in your upper arms and thighs, making it hard to climb stairs or get up from a seated position.^[8]

For women, high cortisol can disrupt menstrual cycles, causing periods to become irregular or stop altogether. Excess facial and body hair may grow in a pattern called hirsutism. For men, the condition can affect sexual function and reduce fertility. Both men and women may notice decreased interest in sex.^[3]

High cortisol doesn’t just affect your physical health—it can also impact your emotional wellbeing. Many people experience mood changes including depression, anxiety, irritability, and difficulty concentrating. You might have trouble sleeping, feel mentally foggy, or struggle to remember things.^[16]

Symptoms of Low Cortisol (Hypocortisolism)

When your body doesn’t produce enough cortisol, the symptoms can be quite different but equally concerning. Persistent, overwhelming fatigue is often the most prominent complaint—a bone-deep tiredness that doesn’t improve with rest and makes even simple daily tasks feel exhausting.^[2]

You may experience progressive weight loss despite eating normally, along with a decreased appetite and feelings of nausea. Many people develop persistent stomach pain or discomfort. Muscle weakness and joint pain are common, making physical activity difficult. Unlike the high blood pressure seen with too much cortisol, low cortisol typically causes low blood pressure, which can lead to dizziness or lightheadedness, especially when standing up quickly.^[4]

Low blood sugar episodes may occur, causing shakiness, confusion, or weakness. Vomiting and diarrhea can develop in some cases. People with primary adrenal insufficiency (Addison disease) often develop dark patches of skin, particularly on areas exposed to friction or pressure, such as the knuckles, elbows, knees, and in scars. These dark areas result from the body producing extra melanin in response to high ACTH levels.^[9]

You might find yourself craving salty foods more than usual. Emotional symptoms include depression, irritability, and difficulty concentrating. In women, decreased body hair under the arms and in the pubic area may occur, along with reduced sexual desire.^[5]

Prevention

While some causes of abnormal cortisol levels cannot be prevented—such as genetic conditions or autoimmune diseases—there are several steps you can take to support healthy cortisol balance and reduce your risk of cortisol-related problems.

Managing stress effectively is one of the most important preventive measures. Since chronic stress is a major trigger for elevated cortisol, learning to handle life’s challenges in healthy ways can help keep your hormone levels balanced. This doesn’t mean eliminating all stress from your life, which isn’t realistic, but rather developing strategies to respond to stress more effectively. Setting priorities in your life can help you avoid unnecessary stressors. Consider which obligations are truly important and whether some commitments could be reduced or eliminated.^[18]

Regular practice of stress-reduction techniques can make a significant difference. Mindfulness meditation, deep breathing exercises, yoga, tai chi, and guided visualization are all proven methods for activating your body’s relaxation response. Even dedicating just five to ten minutes several times a day to deep breathing can help lower cortisol levels over time. These practices help counteract the stress response and give your body permission to return to a calmer state.^[14]

Prioritizing sleep is crucial for maintaining healthy cortisol rhythms. Most adults need seven to eight hours of sleep per night. Establishing a consistent sleep schedule—going to bed and waking up at roughly the same times each day—helps regulate your body’s natural cortisol cycle. Create a relaxing bedtime routine, keep your bedroom cool and dark, and avoid electronic screens for at least an hour before bed. If you have chronic sleep problems such as insomnia or sleep apnea, seeking treatment for these conditions can help normalize cortisol patterns.^[14]

Regular physical activity supports healthy cortisol regulation. Aim for 30 to 50 minutes of moderate exercise most days of the week. Walking, swimming, cycling, and strength training are all beneficial. Exercise should push you to a level where you can still hold a conversation but couldn’t comfortably sing. However, it’s important not to overdo it—excessive or overly intense exercise can actually raise cortisol levels. Balance is key.^[22]

Eating a balanced, nutrient-dense diet helps support healthy hormone production and stress response. Focus on whole foods including plenty of fruits, vegetables, whole grains, lean proteins, and healthy fats. Foods high in dietary fiber—such as beans, nuts, seeds, and whole grains—can help regulate cortisol. Omega-3 fatty acids from fish like salmon, sardines, and mackerel may also support healthy cortisol levels. Limiting added sugars, processed foods, and saturated fats is beneficial, as diets high in these components have been linked to higher cortisol levels.^[18]

Being mindful of caffeine intake is worthwhile, as caffeine can raise cortisol levels. If you find that coffee makes you feel anxious or jittery, consider limiting your consumption to one cup per day or switching to decaffeinated options. This can be particularly helpful for people dealing with chronic stress or anxiety.^[22]

If you take glucocorticoid medications, work closely with your healthcare provider to use the lowest effective dose for the shortest time necessary. Never adjust or stop these medications on your own, as doing so can cause serious complications. Your doctor can help you safely taper off the medication when appropriate, allowing your adrenal glands time to resume normal cortisol production.^[16]

Regular medical checkups can help identify problems early. If you have risk factors for cortisol disorders—such as taking long-term steroid medications, having a family history of endocrine disorders, or experiencing persistent symptoms—discuss these concerns with your healthcare provider. Early detection and treatment of cortisol imbalances can prevent serious complications.

Pathophysiology

Understanding how cortisol abnormalities affect your body’s normal functioning helps explain why the symptoms can be so widespread and varied. Cortisol influences nearly every organ system and helps regulate numerous essential processes, so when levels are too high or too low, the consequences ripple throughout your entire body.

In the normal state, cortisol is synthesized from cholesterol in the outer layer of your adrenal glands, specifically in an area called the zona fasciculata. The production process is carefully controlled by your hypothalamus and pituitary gland working together. When your hypothalamus detects low cortisol levels in your blood, it releases CRH, which signals your pituitary to produce ACTH. This hormone then travels through your bloodstream to your adrenal glands, where it stimulates the production and release of cortisol.^[6]

Most of the cortisol circulating in your blood is bound to proteins and inactive. A special enzyme called 11-beta-hydroxysteroid dehydrogenase converts the inactive form to its active form in most tissues throughout your body. In the kidneys and pancreas, a different version of this enzyme does the opposite—it inactivates cortisol back to an inactive form called cortisone. This system allows your body to fine-tune cortisol’s effects in different organs.^[6]

When cortisol levels are chronically elevated, several bodily systems become disrupted. In terms of metabolism, excess cortisol promotes the breakdown of proteins in your muscles to provide building blocks for glucose production. This explains why people with Cushing syndrome develop muscle weakness and thin arms and legs despite gaining weight elsewhere. At the same time, cortisol signals your pancreas to reduce insulin production and increase glucagon, both of which raise blood sugar levels. This is why prolonged high cortisol increases the risk of developing type 2 diabetes.^[6]

Cortisol also affects how your body stores and redistributes fat. High levels cause fat to accumulate in specific areas—the face, upper back, and abdomen—while fat is lost from the arms and legs. The mechanisms behind this selective fat distribution aren’t completely understood but involve complex interactions between cortisol and other hormones, as well as differences in how fat cells in various body regions respond to cortisol.

Excess cortisol suppresses your immune system by inducing death of certain immune cells called T cells, reducing antibody production by B cells, and limiting the migration of neutrophils to areas of inflammation. While short bursts of cortisol can help limit excessive inflammation, chronically high levels leave you more vulnerable to infections and reduce your ability to fight off diseases.^[6]

The cardiovascular effects of excess cortisol include elevated blood pressure through multiple mechanisms. Cortisol affects how your blood vessels respond to other hormones that control blood pressure, makes your kidneys retain sodium and water, and directly influences heart function. Over time, these changes increase the risk of heart disease and stroke.

Cortisol normally helps control inflammation throughout your body. However, when levels remain elevated, this anti-inflammatory effect can actually become harmful. Your body adapts to the constant presence of high cortisol, and paradoxically, you may develop increased inflammation and a weakened immune response.^[1]

When cortisol levels are too low, different but equally serious problems occur. Without adequate cortisol, your body cannot properly respond to stress, making even minor illnesses or injuries potentially dangerous. Your blood pressure may drop too low because cortisol normally helps maintain blood vessel tone and fluid balance. This explains why people with adrenal insufficiency often feel dizzy or lightheaded, especially when standing up quickly.

Low cortisol impairs your body’s ability to maintain normal blood sugar levels, particularly during fasting or stress. Cortisol normally helps mobilize glucose stores and produce new glucose when needed. Without enough cortisol, blood sugar can drop dangerously low, causing confusion, weakness, and in severe cases, loss of consciousness.^[20]

The profound fatigue experienced with low cortisol stems from multiple factors: impaired energy metabolism, low blood pressure reducing oxygen delivery to tissues, and disrupted circadian rhythms. Normally, cortisol levels peak in the early morning hours before you wake up, helping your body transition from sleep to wakefulness. When this morning cortisol surge is absent or inadequate, it becomes extremely difficult to wake up and feel alert.

In primary adrenal insufficiency, where the adrenal glands themselves are damaged, production of another hormone called aldosterone is also impaired. Aldosterone helps your kidneys regulate sodium and potassium balance. Without enough aldosterone, you lose too much sodium in your urine and retain too much potassium, leading to electrolyte imbalances that can affect heart rhythm and muscle function. This explains why people with Addison disease often crave salt—their bodies are trying to compensate for ongoing sodium losses.^[17]

Cortisol normally helps modulate the immune system, so inadequate cortisol can lead to increased inflammation in some situations. This may contribute to joint and muscle pain commonly reported by people with adrenal insufficiency. The darkening of skin seen in primary adrenal insufficiency occurs because damaged adrenal glands can’t respond to ACTH, so the pituitary gland produces increasingly high levels of this hormone. ACTH shares chemical similarities with melanocyte-stimulating hormone, which triggers increased melanin production in skin cells, resulting in the characteristic darkening.^[9]