Cushing’s Syndrome: Causes, Symptoms & Treatment Canada
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Cushing’s syndrome is a rare but serious hormonal condition that develops when your body is exposed to dangerously high levels of cortisol over an extended period. Affecting thousands of Canadians each year, this disorder can cause significant health complications if left undiagnosed — making early awareness essential for patients and families across Canada.
What Causes Cushing’s Syndrome and Who Is at Risk?
Also known as hypercortisolism, this condition occurs either because your body produces too much cortisol on its own or because of long-term use of corticosteroid medications. Cortisol plays a vital role in regulating blood pressure, blood sugar, and your body’s stress response, but when levels remain elevated, the effects on your health can be severe. Understanding the causes and recognizing the hypercortisolism symptoms early gives you the best chance of getting timely treatment from your family doctor.
What Is Cushing’s Syndrome?
| Treatment Option | How It Works | Benefits | Key Considerations |
|---|---|---|---|
| Surgical Removal (Transsphenoidal Surgery) | Removes pituitary adenoma causing excess ACTH production | Potential cure in 70–90% of pituitary-dependent cases; rapid cortisol normalization | Requires specialized neurosurgical expertise; available at major Canadian academic centres; possible hypopituitarism post-surgery |
| Adrenal Surgery (Adrenalectomy) | Removes one or both adrenal glands producing excess cortisol | Effective for adrenal tumours; laparoscopic options reduce recovery time | Bilateral adrenalectomy requires lifelong steroid replacement therapy; risk of Nelson’s syndrome |
| Steroidogenesis Inhibitors (e.g., Ketoconazole, Metyrapone) | Block cortisol production in the adrenal glands | Useful when surgery is not immediately possible; helps stabilize cortisol levels pre-operatively | Requires regular monitoring of cortisol and liver function; drug interactions possible; coverage varies by province |
| Radiation Therapy (Radiotherapy) | Targets residual pituitary tumour tissue to reduce ACTH secretion | Option for patients with persistent disease after surgery; stereotactic radiosurgery offers precision | Slow onset of effect (months to years); risk of hypopituitarism; available at select Canadian cancer centres |
| Glucocorticoid Receptor Antagonist (Mifepristone) | Blocks cortisol’s effect at the receptor level without lowering cortisol levels | Improves glucose control and metabolic symptoms; option for Cushing’s syndrome with type 2 diabetes | Cortisol levels remain elevated or rise; requires careful clinical monitoring; limited availability in Canada |
Cushing’s syndrome — also called hypercortisolism — develops when your body is exposed to high levels of cortisol for a long period of time. This can happen because your body is making too much cortisol on its own, or because you are taking medications that act like cortisol. Either way, the effects on your health can be significant.
Cortisol is often called the “stress hormone.” It plays an important role in regulating blood pressure, blood sugar, and your body’s response to illness or injury. However, when cortisol levels stay too high for too long, the body begins to break down in a number of ways.
Without proper treatment, Cushing’s syndrome can lead to serious complications, including diabetes, heart disease, and bone fractures. In rare cases, it can be life-threatening. For more background, visit Health Canada’s hormone health resources.
How Your Adrenal Glands Control Cortisol
To understand Cushing’s syndrome, it helps to know how cortisol is normally made. Your body has two adrenal glands — one sitting on top of each kidney. These small but powerful glands produce cortisol and other important hormones.
Your brain controls how much cortisol is made through a chain of signals. First, the hypothalamus — a small region deep in the brain — releases a hormone called CRH (corticotropin-releasing hormone). CRH tells the pituitary gland, located at the base of the brain, to release ACTH (adrenocorticotropic hormone). ACTH then travels through the bloodstream and signals the adrenal glands to produce cortisol.
This system works like a thermostat. When cortisol levels are high enough, the brain slows down the signals. When levels drop, the signals speed up again. In Cushing’s syndrome, something breaks this feedback loop — and cortisol production keeps going when it should stop.
Common Causes of Cushing’s Syndrome
There are several reasons why cortisol levels can become too high. Understanding the cause matters, because treatment depends on it.
Steroid Medications (Iatrogenic Cushing’s Syndrome)
The most common cause of Cushing’s syndrome in Canada is long-term use of corticosteroid medications. These drugs are prescribed for many conditions, including rheumatoid arthritis, lupus, asthma, and organ transplant rejection. When taken in high doses over a long time, they mimic the effects of too much cortisol. This form is called iatrogenic Cushing’s syndrome.
A Tumour on the Pituitary Gland (Cushing’s Disease)
When a small, non-cancerous tumour grows on the pituitary gland, it produces too much ACTH. This causes the adrenal glands to overproduce cortisol. This specific form is called Cushing’s disease. It is more common in women and accounts for about 70% of non-medication-related cases.
Adrenal Gland Tumours
In some cases, a tumour grows directly on one of the adrenal glands. These tumours — which can be benign or malignant — produce cortisol on their own, independent of ACTH signals. Adrenal tumours account for about 15 to 20% of Cushing’s syndrome cases.
Other Causes
Less commonly, Cushing’s syndrome can result from tumours in other parts of the body — such as the lungs, pancreas, or thyroid — that produce ACTH on their own. This is called ectopic ACTH syndrome. Rare genetic conditions can also cause adrenal gland overgrowth, leading to excess cortisol production.
Recognising the Symptoms of Cushing’s Syndrome
The symptoms of Cushing’s syndrome appear gradually, which makes them easy to overlook at first. Not every person will develop all of the symptoms. Furthermore, some symptoms are also common in other conditions. That is why a medical diagnosis is always necessary.
Weight Gain and Changes in Body Shape
Unexplained weight gain is the most frequent symptom of Cushing’s syndrome. Fat tends to build up in specific places — around the abdomen, on the upper back between the shoulders (sometimes called a “buffalo hump”), and in the face. The face often becomes round and puffy, giving what doctors call a “moon face” appearance.
Skin Changes
Excess cortisol weakens the skin. As a result, the skin becomes thin, fragile, and bruises easily. Wounds may heal very slowly. Many people develop wide, reddish-purple stretch marks — called striae — on the abdomen, thighs, breasts, or buttocks. Acne and facial flushing are also common.
Muscle and Bone Weakness
Cushing’s syndrome gradually weakens both muscles and bones. People often notice it becomes hard to climb stairs, get up from a chair, or lift objects. Over time, cortisol breaks down bone density, leading to osteoporosis. This raises the risk of fractures, especially in the spine and ribs.
Mood and Behaviour Changes
High cortisol levels strongly affect mental health. People with Cushing’s syndrome often experience irritability, anxiety, and difficulty sleeping. In addition, many develop depression. These changes in behaviour can be just as disabling as the physical symptoms.
Hormonal and Reproductive Changes
Cushing’s syndrome disrupts normal hormone balance. Women may notice irregular or missed periods and increased facial hair (a condition called hirsutism). Men may experience erectile dysfunction or reduced sex drive. These changes happen because excess cortisol interferes with reproductive hormones.
High Blood Pressure and Blood Sugar
Cortisol raises both blood pressure and blood sugar levels. Therefore, many people with Cushing’s syndrome develop hypertension or type 2 diabetes — sometimes without realising it. These conditions are usually detected through routine blood and urine tests at a medical appointment.
Eye Problems
In some cases, Cushing’s syndrome can affect the eyes. Glaucoma and cataracts have been linked to long-term high cortisol. If the cause is a pituitary tumour, it may press on the nerves that control vision — causing loss of peripheral (side) vision. This is a serious sign that needs immediate medical attention.
For a detailed overview of symptoms, Mayo Clinic’s guide to Cushing’s syndrome is a reliable resource.
How Is Cushing’s Syndrome Diagnosed?
Diagnosing Cushing’s syndrome can take time, because its symptoms overlap with many other conditions. Your doctor will start by reviewing your medical history and any medications you are taking. They will then order specific tests to measure cortisol levels in your blood, urine, or saliva.
Common diagnostic tests include a 24-hour urine cortisol test, a late-night saliva test, or a dexamethasone suppression test. If cortisol levels are confirmed to be high, imaging tests — such as an MRI or CT scan — may be used to look for tumours on the pituitary or adrenal glands.
It is important to note that not everyone with high cortisol has Cushing’s syndrome. Stress, depression, alcoholism, and obesity can all raise cortisol levels temporarily. A specialist — usually an endocrinologist — will interpret your results carefully before making a diagnosis. Learn more from Healthline’s overview of Cushing’s syndrome diagnosis.
When to See a Doctor
If you notice unexplained weight gain — especially around your abdomen or upper back — combined with skin bruising, stretch marks, or mood changes, it is worth talking to a healthcare provider. You do not need to wait until all the symptoms appear.
Start with your family doctor. They can order initial blood and urine tests and refer you to an endocrinologist if needed. If you do not have a family doctor, a walk-in clinic can be a good first step. Most provincial health plans in Canada cover the specialist referrals and lab tests involved in diagnosing Cushing’s syndrome.
Early diagnosis leads to better outcomes. The sooner the cause of excess cortisol is found, the sooner treatment can begin — reducing your risk of long-term complications like diabetes, osteoporosis, and heart disease.
Always speak with a qualified healthcare professional before drawing any conclusions about your health. This article is for informational purposes only and does not replace medical advice from your doctor.
Frequently Asked Questions About Cushing’s Syndrome
What are the first signs of Cushing’s syndrome?
The earliest signs of Cushing’s syndrome are often unexplained weight gain — particularly in the face and abdomen — along with easy bruising and fatigue. Skin changes such as reddish stretch marks may also appear early. Because these symptoms develop gradually, many people do not connect them to Cushing’s syndrome right away.
Can Cushing’s syndrome go away on its own?
Cushing’s syndrome does not typically go away on its own and usually requires medical treatment. If the cause is long-term steroid medication, your doctor may gradually reduce your dose under close supervision. However, if a tumour is causing excess cortisol, surgery or other treatments are usually needed.
Is Cushing’s syndrome the same as Cushing’s disease?
Cushing’s syndrome is the general term for any condition that causes too much cortisol in the body. Cushing’s disease is a specific type of Cushing’s syndrome caused by a non-cancerous tumour on the pituitary gland that produces excess ACTH. In other words, Cushing’s disease is one cause of Cushing’s syndrome.
How is Cushing’s syndrome treated?
Treatment for Cushing’s syndrome depends on the underlying cause. If steroid medications are responsible, the doctor may slowly reduce the dosage. For tumours on the pituitary or adrenal glands, surgery is often the primary treatment. Radiation therapy and cortisol-lowering medications may also be used in certain cases.
Who is most at risk of developing Cushing’s syndrome in Canada?
Cushing’s syndrome can affect anyone, but it is most commonly diagnosed in adults between the ages of 25 and 50. People who take long-term corticosteroid medications for conditions like asthma, lupus, or arthritis face a higher risk. Women are also slightly more likely than men to develop the non-medication-related forms of Cushing’s syndrome.
Can Cushing’s syndrome cause mental health problems?
According to Mayo Clinic’s overview of Cushing’s syndrome, this information is supported by current medical research.
For more information, read our guide on pituitary tumours and how they affect cortisol hormone disorders.
Yes, Cushing’s syndrome frequently affects mental health. High cortisol levels can cause anxiety, irritability, insomnia, and depression. These behaviour changes are a recognised part of the condition, not a separate issue. Treating the underlying hormonal imbalance often leads to significant improvement in mood and overall wellbeing.
Key Takeaways
- Cushing’s syndrome develops when the body has too much cortisol — from medication or from the body itself.
- The most common cause in Canada is long-term use of corticosteroid medications for conditions like asthma, arthritis, or lupus.
- Symptoms appear gradually and include weight gain around the face and belly, thin and fragile skin, muscle weakness, mood changes, and high blood pressure.
- Not everyone will develop all symptoms — so do not wait for the full picture before speaking to a doctor.
- A family doctor or walk-in clinic is the right first step if you suspect Cushing’s syndrome. Most provincial health plans cover the tests and referrals needed.
- Early diagnosis and treatment significantly reduce the risk of serious complications such as osteoporosis, diabetes, and heart disease.
- Always consult a qualified healthcare professional for a proper diagnosis and personalised treatment plan.
Frequently Asked Questions
What is Cushing’s syndrome?
Cushing’s syndrome is a hormonal disorder caused by prolonged exposure to high levels of cortisol. It can result from the body producing too much cortisol or from long-term use of corticosteroid medications. It affects metabolism, immune function, and physical appearance, and requires medical diagnosis and treatment.
What are the symptoms of Cushing’s syndrome?
Common symptoms include unexplained weight gain, a rounded ‘moon face,’ fatty deposits between the shoulders (buffalo hump), purple stretch marks, thin skin, easy bruising, high blood pressure, fatigue, and muscle weakness. Women may experience irregular periods. Symptoms develop gradually, making early diagnosis challenging.
How is Cushing’s syndrome treated in Canada?
Treatment depends on the underlying cause. Options include surgery to remove tumours on the pituitary or adrenal glands, radiation therapy, or medications that reduce cortisol production. If caused by steroid medications, doctors gradually reduce the dosage. Canadian endocrinologists typically oversee long-term management of this condition.
Can Cushing’s syndrome be prevented?
Cushing’s syndrome caused by tumours generally cannot be prevented. However, medication-induced Cushing’s syndrome can be minimized by using corticosteroids at the lowest effective dose for the shortest time possible. Regular monitoring by a healthcare provider when on long-term steroid therapy helps reduce the risk of developing the condition.
When should I see a doctor about Cushing’s syndrome?
See a doctor if you notice unexplained weight gain around the abdomen or face, unusual stretch marks, easy bruising, persistent fatigue, or high blood pressure — especially if you use corticosteroid medications. Early diagnosis is important, as untreated Cushing’s syndrome can lead to serious complications including diabetes, osteoporosis, and cardiovascular disease.
About the Author
Dr. James Okafor, MD, PhDDr. James Okafor holds an MD and PhD in Neurological Sciences from McGill University. With 12 years of experience in clinical neurology and mental health research, he has contributed to landmark studies on depression, anxiety, and cognitive health. Dr. Okafor is a Fellow of the Royal College of Physicians and Surgeons of Canada and serves on the editorial board of two peer-reviewed journals.
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