Introduction
Cushing syndrome is a group of signs and metabolic problems caused by long-term exposure to high cortisol. Cortisol is a stress hormone made by the adrenal glands; too much for too long changes body fat, skin, muscles, blood pressure, glucose, and mood.
The most common overall cause worldwide is prolonged use of glucocorticoid medicines (exogenous Cushing). Endogenous forms arise when the body itself overproduces cortisol—often from a pituitary ACTH-secreting tumour (Cushing disease), an adrenal tumour, or, less often, ectopic ACTH from another tumour.
People may notice central weight gain, a rounded face, easy bruising, purple stretch marks, muscle weakness, high blood pressure, diabetes, and bone loss. Because these features overlap with common conditions, careful testing is needed before treatment.
Management aims to normalise cortisol safely—by adjusting steroid medicines, removing or treating tumours, or using cortisol-lowering drugs. This page explains the condition in plain language for education; personal care belongs with an endocrinology team.
Overview
Cushing syndrome describes chronic cortisol excess from any source. Cushing disease specifically means a pituitary adenoma driving ACTH and adrenal cortisol production.
Diagnosis usually starts by confirming hypercortisolism with late-night salivary cortisol, 24-hour urinary free cortisol, and/or a low-dose dexamethasone suppression test, then finding the source with ACTH levels and imaging.
Untreated cortisol excess raises cardiovascular risk, infection vulnerability, osteoporosis, and psychiatric burden. With accurate source control, many features improve over months, though some changes reverse slowly.
- Prolonged high cortisol from medicines or internal overproduction
- Classic clues: central obesity, moon face, striae, weakness, hypertension, diabetes
- Exogenous glucocorticoids are a frequent cause
- Endogenous causes: pituitary, adrenal, or ectopic ACTH tumours
- Confirm excess cortisol, then locate the source
- Treatment: stop/taper steroids when possible, surgery, medicines, or radiation
What happens in the body
Cortisol normally follows a day–night rhythm and rises with stress. Sustained high levels increase gluconeogenesis, break down muscle protein, thin skin, redistribute fat to the trunk and face, retain sodium, and suppress immune responses.
ACTH from the pituitary (or ectopic tumours) stimulates both adrenals. Primary adrenal tumours can make cortisol independently and suppress ACTH. Exogenous steroids mimic cortisol and can shrink the adrenal glands over time.
- Chronic cortisol excess → catabolic and metabolic effects
- ACTH-dependent disease drives bilateral adrenal overactivity
- ACTH-independent adrenal tumours secrete cortisol directly
- Glucocorticoid tablets, injections, or inhaled high-dose steroids can induce the syndrome
- Loss of normal evening cortisol fall is a key biological clue
Signs and symptoms
Features develop gradually and vary. Common findings include:
- Weight gain centred on the face, neck, and abdomen with relatively thinner arms and legs
- Rounded “moon” face and fat pad at the upper back (“buffalo hump”)
- Wide purple or reddish stretch marks on the abdomen, thighs, or arms
- Thin, fragile skin that bruises easily and heals slowly
- Muscle weakness, especially rising from a chair or climbing stairs
- High blood pressure that may be hard to control
- High blood sugar or new/worsening type 2 diabetes
- Irregular periods, reduced fertility, or excess facial/body hair in women
- Reduced libido or erectile difficulties in men
- Mood changes: irritability, anxiety, depression, or cognitive fog
- Bone loss, fractures, or back pain from osteoporosis
- More frequent infections
Causes and risk factors
Clinicians separate medicine-related excess from internal hormone overproduction:
- Long-term glucocorticoid therapy (tablets, frequent injections, or high-dose inhaled/topical use)
- Pituitary adenoma secreting ACTH (Cushing disease)
- Adrenal adenoma, hyperplasia, or adrenal cancer producing cortisol
- Ectopic ACTH secretion from tumours elsewhere (for example certain lung tumours)
- Rare genetic or familial adrenal disorders
- Higher clinical suspicion in people with obesity, type 2 diabetes, hypertension, and suggestive physical signs—especially women
Diagnosis and evaluation
Many everyday conditions mimic Cushing. Testing usually proceeds in steps:
- History of steroid medicines, supplements, and skin/joint injections
- Exam for striae, proximal weakness, bruising, and fat redistribution
- Late-night salivary cortisol measurement
- 24-hour urinary free cortisol collection
- Low-dose dexamethasone overnight or two-day suppression testing
- Plasma ACTH to separate ACTH-dependent from ACTH-independent disease
- MRI of the pituitary when ACTH-dependent disease is likely
- CT or MRI of the adrenals for ACTH-independent cortisol excess
- Inferior petrosal sinus sampling in selected cases to confirm pituitary versus ectopic ACTH
- Search for ectopic sources with targeted imaging when indicated
Treatment and management
Therapy targets the cause and protects the heart, bones, and metabolism while cortisol falls:
- Careful reduction or change of glucocorticoid medicines under medical supervision when exogenous Cushing is present—never stop long-term steroids abruptly
- Transsphenoidal pituitary surgery for Cushing disease when a resectable adenoma is found
- Adrenal surgery for cortisol-secreting adrenal tumours
- Resection of ectopic ACTH-producing tumours when localisable
- Medicines that lower cortisol production or block its effects (examples include ketoconazole, metyrapone, mitotane, osilodrostat, mifepristone, or pasireotide—chosen by specialists)
- Pituitary radiation when surgery is incomplete or unsafe
- Temporary steroid replacement after successful source control until the HPA axis recovers
- Aggressive management of blood pressure, glucose, lipids, clotting risk, and bone health
- Infection vigilance and vaccination review while cortisol is high or during treatment
Prevention, self-care, and lifestyle
Not every condition is fully preventable, but the steps below may lower risk or recurrence:
- Use the lowest effective steroid dose for the shortest necessary time
- Ask clinicians about steroid-sparing options for chronic inflammatory disease
- Do not use unmarked “supplement” products that may contain hidden glucocorticoids
- Keep regular follow-up if you take long-term steroids, including bone and glucose checks
- Seek evaluation for classic physical changes plus new hypertension or diabetes
Possible complications
Delay, missed care, or unsafe self-medication can raise the chance of complications in some cases:
- Cardiovascular disease, stroke, and blood clots
- Poorly controlled diabetes and metabolic syndrome
- Osteoporosis and fragility fractures
- Serious infections
- Muscle wasting and reduced mobility
- Depression, anxiety, or cognitive impairment
- Adrenal insufficiency after abrupt steroid withdrawal or after tumour removal if replacement is inadequate
- Recurrence if a tumour is incompletely treated
When to see a doctor or seek emergency care
Seek prompt medical advice or emergency care if any of the following apply—it is safer not to wait and see:
- Progressive central weight gain with purple striae, easy bruising, and muscle weakness
- New or worsening hypertension and diabetes together with Cushing-like body changes
- Unusual infections, fractures, or severe mood change while on long-term steroids
- Symptoms after stopping steroids: severe fatigue, dizziness, nausea, or collapse (possible adrenal crisis—emergency)
- Known pituitary or adrenal tumour with rising cortisol-related symptoms
Living with the condition
Recovery after cortisol is controlled is gradual: skin and muscle rebuild slowly, and blood pressure or glucose plans often need adjustment. Physiotherapy helps restore strength safely.
Carry medical information if you are on replacement steroids after surgery, and learn sick-day rules for dose increases during illness.
Mental-health support matters—body-image and mood effects of Cushing can linger even after biochemical cure. Keep scheduled endocrine follow-up to watch for recurrence.
Frequently asked questions
Is Cushing syndrome the same as Cushing disease?
Cushing syndrome is cortisol excess from any cause. Cushing disease is the subset driven by a pituitary ACTH-secreting tumour.
Can steroid inhalers or creams cause Cushing syndrome?
High-dose or prolonged inhaled, topical, or injected steroids can contribute, especially when combined with other glucocorticoid sources. Report all steroid exposures to your clinician.
How is Cushing syndrome diagnosed?
Doctors confirm high cortisol with saliva, urine, and/or dexamethasone tests, then use ACTH levels and imaging (and sometimes petrosal sinus sampling) to find the source.
What medicines are used?
Specialists may use drugs that block cortisol production or action when surgery is delayed, incomplete, or not possible. Choices and side effects require close monitoring.
Will body changes reverse after treatment?
Many features improve over months once cortisol normalises, but stretch marks, muscle loss, and bone density may take longer and sometimes need ongoing rehabilitation and bone therapy.
Should I stop steroid tablets on my own?
No. Abruptly stopping long-term steroids can cause life-threatening adrenal insufficiency. Any taper must be planned with a clinician.
Important caution
This article is general health education in English. It is not personal medical advice, a prescription, or a substitute for endocrine assessment.
Decisions about surgery, cortisol-lowering drugs, or steroid tapering should follow evaluation by a qualified clinician.
If you have progressive Cushing-like features—or feel severely unwell after steroid changes—seek medical care promptly.