Cushing's Syndrome: Symptoms, Causes, Diagnosis & Treatment
Illustration of selected physical changes and hormone-related features that may occur with prolonged cortisol excess.
Cushing's syndrome is a rare condition caused by prolonged exposure to higher-than-normal levels of the hormone cortisol. Cortisol helps regulate the body's response to stress, blood pressure, blood sugar, inflammation and metabolism. When cortisol remains excessive for a long time, it can affect many body systems and may lead to changes such as weight gain around the abdomen and upper body, a rounded face, muscle weakness, easy bruising and wide purple stretch marks.
The condition can develop because of long-term use of glucocorticoid medicines or because the body produces too much cortisol. Treatment depends on the underlying cause and may involve carefully adjusting steroid medicines, surgery, medicines that control cortisol, radiation in selected cases, or other specialist treatment.
Cushing's Syndrome: Key Facts at a Glance
Long-term exposure to excessive cortisol or glucocorticoid effects.
Taking glucocorticoid medicines over time, especially at higher doses or through certain routes.
Central weight gain, facial rounding, thin limbs, muscle weakness, bruising and broad purple stretch marks may occur.
Specific cortisol screening tests, often repeated or followed by another test—not a random cortisol measurement alone.
An endocrinologist coordinates hormone testing, identifies the cause and plans treatment.
Many cases can be treated effectively, but recovery and follow-up may take time.
What Is Cushing's Syndrome?
Cortisol is produced by the adrenal glands, which sit above the kidneys. Its release is controlled through a signalling pathway involving the hypothalamus and pituitary gland in the brain. The pituitary releases adrenocorticotropic hormone (ACTH), which signals the adrenal glands to produce cortisol.
Cushing's syndrome, also called hypercortisolism, describes the group of health changes caused by excessive cortisol exposure. The excess may come from medicine taken from outside the body (exogenous or iatrogenic Cushing's syndrome) or from overproduction within the body (endogenous Cushing's syndrome).
Cushing's Syndrome vs Cushing's Disease
| Term | Meaning |
|---|---|
| Cushing's syndrome | The broad condition caused by prolonged exposure to excessive cortisol, regardless of the source. |
| Cushing's disease | A specific type of Cushing's syndrome caused by an ACTH-producing pituitary tumour, usually a pituitary adenoma. |
| Exogenous Cushing's syndrome | Cushingoid effects caused by glucocorticoid medicines taken by mouth, injection, inhalation, topical application or other routes. |
| Endogenous Cushing's syndrome | Excess cortisol produced by the body's own hormone system, due to pituitary, adrenal or ectopic ACTH-related causes. |
All Cushing's disease is Cushing's syndrome, but not all Cushing's syndrome is Cushing's disease.
Common Cushing's Syndrome Symptoms
Symptoms often develop gradually and may become more noticeable over months or years. Not everyone experiences every feature. A combination of progressive signs is more concerning than one isolated symptom.
Increased fat around the abdomen and upper body, sometimes with comparatively thinner arms and legs.
Facial rounding, sometimes called a “moon face,” may develop with prolonged cortisol excess.
Increased fat may collect at the base of the neck or between the shoulders, sometimes called a dorsocervical fat pad.
Broad striae may appear on the abdomen, hips, breasts, thighs or underarms and can be more noticeable than ordinary stretch marks.
Skin may become thin, bruise easily and heal slowly after minor injuries.
Weakness may affect the hips and shoulders, making it harder to climb stairs, stand from a chair or lift objects.
Cortisol excess can contribute to hypertension, insulin resistance and type 2 diabetes.
Anxiety, irritability, low mood, sleep disturbance or difficulty concentrating may occur.
Other Symptoms That May Occur
- Acne or increased facial/body hair in some women.
- Irregular or absent menstrual periods.
- Reduced sex drive or erectile dysfunction in some men.
- Reduced bone strength, fractures or back pain due to osteoporosis.
- Frequent infections or slower recovery from infections.
- Headaches or changes in vision if a pituitary tumour affects nearby structures.
- In children, weight gain accompanied by slower growth in height.
These features are not unique to Cushing's syndrome. Many common conditions can cause weight changes, fatigue, mood symptoms or high blood pressure. The pattern, progression, examination and test results help clinicians decide whether testing is appropriate.
What Causes Cushing's Syndrome?
1. Long-Term Glucocorticoid Medicines
The most common overall cause is exposure to glucocorticoid medicines, which are used to treat conditions such as asthma, autoimmune diseases, inflammatory disorders and after organ transplantation. Examples include prednisone, prednisolone, dexamethasone and hydrocortisone. These medicines may be prescribed as tablets, injections, inhalers, nasal sprays, creams or other preparations. Risk depends on the medicine, dose, duration, route and individual factors.
2. Pituitary ACTH-Producing Tumour (Cushing's Disease)
A usually non-cancerous pituitary tumour can release too much ACTH. This stimulates both adrenal glands to make excess cortisol. This specific cause is known as Cushing's disease.
3. Adrenal Gland Conditions
An adrenal adenoma, adrenal cancer or certain forms of adrenal gland enlargement may produce cortisol independently of normal ACTH control. The type of adrenal condition determines the evaluation and treatment plan.
4. Ectopic ACTH Production
Less commonly, a tumour outside the pituitary—sometimes in the lungs or another organ—produces ACTH and drives the adrenal glands to release excess cortisol. The term “ectopic” means the hormone is being produced outside its usual source.
Risk Factors and Conditions That Can Look Similar
There is no single lifestyle habit that causes endogenous Cushing's syndrome. The risk of medicine-related Cushing's syndrome is influenced by glucocorticoid exposure and individual susceptibility. Some conditions can also create temporary or overlapping changes in cortisol testing, including:
- Major depression and some other psychiatric conditions.
- Heavy alcohol use.
- Severe obesity.
- Poorly controlled diabetes.
- Acute illness, pain, disrupted sleep or significant physical stress.
These situations may cause what clinicians call non-neoplastic hypercortisolism or “pseudo-Cushing” states. They do not automatically mean a person has a cortisol-producing tumour. A clinician interprets test results in the context of health, medicines, sleep schedule and symptoms.
How Is Cushing's Syndrome Diagnosed?
Diagnosis is a stepwise process. The clinician first reviews medicines and symptoms, then chooses appropriate biochemical tests. Imaging is generally used to investigate the cause after biochemical evidence supports the diagnosis—not as a stand-alone screening test.
Step 1: Review All Steroid Exposure
Tell the clinician about every medicine and preparation, including tablets, injections, joint or spinal injections, inhalers, nasal sprays, skin creams, eye drops and supplements. Bring medicine packaging or a current medication list if possible. This step is essential because externally supplied glucocorticoids are a common cause.
Step 2: Initial Cortisol Screening Tests
| Test | What it assesses | Important point |
|---|---|---|
| Late-night salivary cortisol | Checks whether cortisol falls to a low level around bedtime. | Usually collected on two separate nights; timing and sleep schedule matter. |
| 24-hour urinary free cortisol | Measures free cortisol excreted in urine over a full day. | At least two collections are commonly recommended; collection must be complete. |
| 1 mg overnight dexamethasone suppression test | Checks whether a small dose of dexamethasone suppresses cortisol the next morning. | Medicines, absorption and other factors can affect interpretation. |
| 48-hour low-dose dexamethasone suppression test | Another validated suppression approach in selected circumstances. | Used according to specialist judgement and local protocols. |
One abnormal result does not always establish the diagnosis. Clinicians often confirm with another recommended test and consider conditions or medicines that can affect results. A random blood cortisol or random ACTH level is not an appropriate stand-alone screening test for Cushing's syndrome.
Step 3: Identify the Source
After cortisol excess is confirmed, blood ACTH measurement helps classify the condition as ACTH-dependent or ACTH-independent. Depending on the results, the endocrinologist may arrange pituitary MRI, adrenal imaging, additional hormone tests or specialised procedures to locate the source. Imaging findings must be interpreted carefully because small incidental lesions can occur in people without Cushing's syndrome.
Step 4: Assess Related Health Effects
Doctors may assess blood pressure, glucose, cholesterol, bone health, infection risk, mental health and cardiovascular risk. These checks help guide treatment and reduce complications while cortisol excess is being controlled.
Cushing's Syndrome Treatment Options
Treatment aims to remove or control the source of excess cortisol, reduce harmful hormone effects and manage related conditions. The right approach depends on whether the cause is medication-related, pituitary, adrenal or ectopic.
1. Adjusting Glucocorticoid Medicines
If the cause is prescribed glucocorticoids, the clinician may gradually reduce the dose to the lowest effective level or consider an alternative treatment for the original condition. The plan must balance control of the original disease with the risk of adrenal suppression. Never change a steroid prescription independently.
2. Surgery for a Pituitary Cause
For Cushing's disease, transsphenoidal surgery by an experienced pituitary surgeon is generally the preferred initial treatment when feasible. The surgeon reaches the pituitary through the nose or sphenoid sinus to remove the tumour. Hormone levels and pituitary function require close follow-up after surgery.
3. Surgery for an Adrenal Cause
When a cortisol-producing adrenal tumour is responsible, removal of the affected adrenal gland may be recommended. The approach depends on the nature of the lesion and whether one or both adrenal glands are involved.
4. Treatment for Ectopic ACTH-Producing Tumours
If a tumour outside the pituitary is producing ACTH, treatment may involve locating and removing it when possible. Other cancer-directed treatments may be needed depending on tumour type, stage and location.
5. Medicines That Reduce Cortisol Production or Action
Specialist-prescribed medicines may be used when surgery is not possible, before surgery to control severe cortisol excess, or when disease persists or returns. Depending on the clinical situation, options may include medicines that reduce adrenal cortisol production, medicines that act on pituitary tumour activity, or medicines that block cortisol action at its receptor.
These medicines require careful monitoring for side effects, drug interactions, liver or electrolyte problems and cortisol levels that become too low. They are not suitable for self-treatment.
6. Radiation or Further Specialist Treatment
Radiation therapy may be considered for selected pituitary cases when surgery does not fully control the disease or when a tumour persists. Its effect may take time, so additional medical treatment and long-term hormone monitoring may be needed.
7. Bilateral Adrenalectomy in Selected Severe Cases
Removing both adrenal glands can control cortisol production in selected difficult or life-threatening cases when other approaches are unsuitable or unsuccessful. It creates lifelong dependence on adrenal hormone replacement and requires ongoing specialist care.
Can Cushing's Syndrome Be Cured?
Many cases can achieve remission when the underlying source is successfully treated. However, “cure” and recovery are not always immediate. The body may need time to restore normal hormone regulation, and some people need temporary or long-term hormone replacement. Cushing's syndrome can recur, particularly when the underlying cause is not completely removed or when a pituitary tumour returns.
Long-term follow-up with an endocrinologist is important even after symptoms improve. Blood pressure, blood glucose, bone health, mood, muscle strength and other complications may need continued treatment.
Possible Complications if Cushing's Syndrome Is Not Treated
High blood pressure, abnormal cholesterol and increased cardiovascular risk.
Insulin resistance, high blood glucose and type 2 diabetes.
Osteoporosis, fractures, muscle wasting and reduced physical strength.
Greater susceptibility to infection, fragile skin, bruising and slower healing.
Depression, anxiety, irritability, sleep disruption and cognitive difficulties.
Menstrual changes, reduced fertility and sexual-function difficulties may occur.
When Should You See a Doctor?
Arrange a medical appointment if you notice several progressive features—especially broad purple stretch marks, easy bruising, new muscle weakness, facial rounding and central weight gain occurring together—or if you develop unusual osteoporosis, high blood pressure or diabetes at a younger age. Children with increasing weight and slowing height growth should be assessed by a paediatric clinician.
Tell your doctor if you use steroid tablets, injections, inhalers, creams or other glucocorticoid preparations. A clinician can decide whether hormone testing is appropriate and refer you to an endocrinologist when needed.
Can Cushing's Syndrome Be Prevented?
Endogenous Cushing's syndrome caused by a pituitary, adrenal or ectopic tumour generally cannot be prevented through diet or lifestyle changes. However, safer use of prescribed glucocorticoids can reduce the risk of medicine-related Cushingoid effects:
- Use steroid medicines exactly as prescribed and attend medication reviews.
- Do not increase, reduce or stop long-term steroids without medical guidance.
- Tell every healthcare professional about all steroid preparations you use, including creams and injections.
- Ask whether the lowest effective dose or a suitable steroid-sparing treatment is appropriate for your underlying condition.
- Seek review if you notice progressive changes while using glucocorticoids.
There is no proven detox, special diet or over-the-counter supplement that prevents or cures Cushing's syndrome.
Living With Cushing's Syndrome: Practical Support
- Keep a medication record: List prescription medicines, injections, inhalers, creams and supplements, including doses where known.
- Attend planned follow-up: Hormone levels and related health risks may need monitoring for an extended period.
- Support bone health: Ask about bone-density assessment, adequate nutrition, safe physical activity and whether vitamin D or calcium is appropriate for you.
- Monitor blood pressure and glucose: Follow the care plan for hypertension or diabetes if present.
- Protect emotional wellbeing: Mood and sleep changes are real health concerns; discuss them with your care team and seek support when needed.
- Return to activity gradually: Muscle weakness and reduced fitness may take time to improve. Ask your clinician or physiotherapist for a safe plan.
Frequently Asked Questions About Cushing's Syndrome
Showing 12 of 12 questions
1. What are the first signs of Cushing's syndrome?
Early changes may include gradual weight gain around the trunk, facial rounding, increased fat near the neck, muscle weakness, easy bruising or changes in blood pressure and blood sugar. Features vary and may develop slowly.
2. What causes Cushing's syndrome?
The most common overall cause is long-term exposure to glucocorticoid medicines. Endogenous causes include pituitary ACTH-producing tumours, adrenal conditions that produce cortisol and, less commonly, tumours outside the pituitary that release ACTH.
3. What is the difference between Cushing's syndrome and Cushing's disease?
Cushing's syndrome is the broad condition caused by prolonged cortisol excess. Cushing's disease is one specific type caused by an ACTH-producing pituitary tumour.
4. Does Cushing's syndrome cause weight gain?
It can cause weight gain, often around the abdomen and upper body, with comparatively thinner arms and legs. Weight gain alone is common and does not diagnose Cushing's syndrome.
5. Can Cushing's syndrome cause a round face?
Yes. Prolonged cortisol excess can lead to facial rounding, sometimes called a moon face. This appearance can also have other causes, including glucocorticoid medication use.
6. Which tests diagnose Cushing's syndrome?
Recommended initial tests include late-night salivary cortisol, 24-hour urinary free cortisol and dexamethasone suppression testing. Clinicians select and interpret tests according to the person's circumstances, and abnormal results often need confirmation.
7. Is a random blood cortisol test enough?
No. A random serum cortisol or plasma ACTH measurement is not recommended as a stand-alone screening test for Cushing's syndrome. Specific validated tests are used to assess cortisol excess.
8. Can steroid medicines cause Cushing's syndrome?
Yes. Long-term glucocorticoid exposure can cause Cushingoid features. Steroids should never be stopped suddenly after prolonged use; a clinician must guide any dose reduction.
9. Can Cushing's syndrome be cured?
Many cases can achieve remission when the source of excess cortisol is successfully treated. Some people need ongoing monitoring, additional treatment or hormone replacement, and recurrence is possible.
10. Does Cushing's syndrome affect children?
Yes, although it is uncommon. A key warning pattern in children is weight gain together with slowing growth in height. A paediatric endocrinologist can assess this pattern.
11. Can stress alone cause Cushing's syndrome?
Everyday stress does not cause the tumour-related condition known as Cushing's syndrome. Severe stress and some health conditions can affect cortisol testing, so results need clinical interpretation.
12. Which doctor treats Cushing's syndrome?
An endocrinologist usually leads diagnosis and treatment. Depending on the cause, care may also involve a pituitary or adrenal surgeon, radiologist, oncologist and other specialists.
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Trusted Medical Sources and Further Reading
- National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK): Cushing's Syndrome — symptoms, causes, diagnosis and treatment overview.
- Endocrine Society: Diagnosis of Cushing's Syndrome — who should be tested and recommended initial screening tests.
- Endocrine Society: Treatment of Cushing's Syndrome — treatment goals and cause-directed management.
- Endocrine Reviews (2026): Update and Practical Recommendations for Medical Treatment of Cushing Syndrome — contemporary review of medical treatment approaches.
- SEEN Consensus (2025): Management of Severe Cushing's Syndrome — specialist consensus for severe disease.
Conclusion: Recognise the Pattern and Seek the Right Evaluation
Cushing's syndrome is a hormone disorder caused by prolonged exposure to excessive cortisol. Progressive central weight gain, facial rounding, wide purple stretch marks, easy bruising and muscle weakness can raise suspicion, especially when several features occur together. However, symptoms alone cannot confirm the condition, and many common health problems can look similar.
Accurate diagnosis begins with a careful review of steroid medicines and appropriate cortisol screening tests. Once excess cortisol is confirmed, an endocrinologist investigates the source and recommends treatment tailored to the cause. Do not stop prescribed steroids suddenly or try unproven cortisol-lowering products. Early specialist care can help reduce complications and improve long-term health.
Medical disclaimer: This article is for general educational purposes only and does not replace professional medical advice, diagnosis or treatment. Cushing's syndrome requires specialist assessment and carefully interpreted laboratory testing. Never stop or alter prescribed glucocorticoid medicines without medical supervision. If you have severe symptoms, suspected adrenal crisis or a serious infection, seek urgent medical care.
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