Cushing Syndrome: Recognition, Assessment and Emergency Management

Why this topic matters: Cushing syndrome is prolonged exposure to excessive cortisol, from prescribed glucocorticoids or abnormal endogenous cortisol production. Although the classic changes develop gradually, the patient may present to emergency care with severe hypertension, hyperglycaemia, hypokalaemia, infection, thromboembolism, psychosis, fracture, gastrointestinal bleeding or acute illness after steroid withdrawal. Emergency providers must recognise the phenotype, protect the patient from immediate complications, identify steroid exposure and coordinate urgent endocrine, medical and surgical care without abruptly stopping essential glucocorticoids.

Learning objectives

Define Cushing syndrome and distinguish exogenous steroid excess from endogenous ACTH/cortisol overproduction.
Recognise characteristic appearance, metabolic complications and red flags requiring emergency escalation.
Perform a structured ABCDE assessment and take a medication, infection, thrombotic and psychiatric history.
Describe appropriate investigations, acute stabilisation, complication management and definitive specialist treatment.
Explain why glucocorticoids must never be stopped abruptly and how to prevent steroid-related harm.

Definition and cortisol physiology

Cortisol is produced by the adrenal cortex under hypothalamic CRH and pituitary ACTH control. It supports vascular tone, glucose availability, stress responses, immune regulation and metabolism. Cushing syndrome is the clinical state caused by chronic exposure to cortisol or a glucocorticoid medicine above the body’s normal requirement. Cushing disease is the specific form caused by an ACTH-producing pituitary adenoma.

Excess cortisol increases gluconeogenesis and insulin resistance, promotes protein breakdown and skin thinning, redistributes fat, increases vascular sensitivity to catecholamines, suppresses immune responses and causes bone loss. Mineralocorticoid effects at high cortisol levels can produce sodium retention, hypertension and potassium loss. Exogenous steroids also suppress ACTH; sudden cessation can therefore precipitate adrenal insufficiency or crisis.

Causes and classification

Category	Examples	Emergency clues
Exogenous / iatrogenic	Long-term oral prednisolone, dexamethasone, hydrocortisone, repeated injections, potent inhaled/topical steroids or interacting medicines that increase steroid levels.	Medication list, proximal weakness, bruising, diabetes, infection, poor wound healing; risk of adrenal suppression if stopped suddenly.
ACTH-dependent endogenous	Pituitary corticotroph adenoma (Cushing disease) or ectopic ACTH/CRH from a tumour.	Rapid progression, severe hypokalaemia, muscle weakness, weight loss or malignancy symptoms suggest ectopic production.
ACTH-independent endogenous	Adrenal adenoma, carcinoma or bilateral adrenal hyperplasia.	Marked virilisation, abdominal mass, severe cortisol excess or rapidly progressive features need urgent specialist review.
Non-Cushing mimics	Alcohol excess, severe depression, obesity, poorly controlled diabetes, pregnancy and some medicines.	Confirm biochemically; do not label on appearance alone.

Typical clinical features

Weight gain with central/truncal obesity, rounded “moon” face, dorsocervical fat pad and relatively thin limbs.
Wide violaceous abdominal, breast or thigh striae; thin fragile skin, easy bruising, acne, facial plethora and slow wound healing.
Proximal muscle weakness, difficulty climbing stairs or rising from a chair, fatigue and osteoporosis with vertebral or rib fractures.
Hypertension, oedema, glucose intolerance/diabetes, dyslipidaemia and hypokalaemic metabolic alkalosis in severe cases.
Menstrual irregularity, reduced libido, infertility, hirsutism or virilisation; impaired growth in children.
Depression, anxiety, irritability, insomnia, impaired concentration, mania, psychosis or suicidal thoughts.
Frequent or atypical infection, oral thrush, urinary infection, pneumonia and poor response to vaccines.

Emergency red flags

Escalate immediately for: severe headache or visual loss, hypertensive emergency, chest pain or pulmonary embolism symptoms, sepsis, rapidly worsening weakness, hypokalaemic dysrhythmia, severe hyperglycaemia/DKA, acute psychosis or suicidality, gastrointestinal bleeding, new fracture, spinal cord compression or suspected adrenal crisis after steroid reduction.

Hypertensive emergency: very high BP with encephalopathy, seizures, chest pain, pulmonary oedema, renal injury or visual symptoms.
Thromboembolism: sudden dyspnoea, pleuritic pain, haemoptysis, unilateral leg swelling or unexplained tachycardia.
Severe infection: fever or hypothermia, confusion, hypotension, tachypnoea, new cough, dysuria or a subtle wound in an immunosuppressed patient.
Electrolyte crisis: weakness, cramps, palpitations, syncope or ECG changes suggesting hypokalaemia.

First contact and scene priorities

Use standard precautions and assess infection, fall, fracture, medication and self-harm risks.
Introduce yourself, obtain consent where possible and ask for all steroid containers, inhalers, creams, injections, diabetes medicines and recent hospital letters.
Assess airway, breathing and circulation before focusing on appearance. A patient who looks “Cushingoid” may still have sepsis, pulmonary embolism, stroke or myocardial infarction.
Do not abruptly discontinue prescribed glucocorticoids. Record the last dose and contact the prescriber/endocrine team urgently when the patient is acutely ill.
Use safe movement and fracture precautions; fragile bones, proximal weakness and obesity increase transfer and fall risk.

ABCDE assessment

A — Airway

Assess speech, secretions, facial infection, obesity-related obstruction, vomiting and reduced consciousness.
Consider aspiration, sepsis, sedative use or severe metabolic disturbance if mental status is abnormal.

B — Breathing

Count respiratory rate, measure SpO₂ and inspect for pneumonia, pulmonary oedema or pulmonary embolism.
Sudden breathlessness, pleuritic pain, haemoptysis or unexplained tachycardia is an emergency; give oxygen for hypoxaemia and arrange urgent transfer.

C — Circulation

Measure BP in both arms when indicated, pulse, capillary refill, temperature, peripheral oedema and urine output.
Check for shock, severe hypertension, dehydration, chest pain, irregular pulse and unilateral leg swelling.
Establish IV access in severe illness and collect glucose, electrolytes, renal function, full blood count and cultures when indicated.

D — Disability

Record AVPU/GCS, pupils, headache, visual fields, focal deficits, behaviour and suicide risk.
Check bedside glucose; cortisol excess can worsen diabetes, while steroid withdrawal can cause hypoglycaemia.

E — Exposure

Inspect skin, bruises, striae, wounds, injection sites, oral thrush, pressure areas, swelling and signs of fracture.
Measure temperature, weight if safe and signs of infection; preserve dignity and prevent heat loss.

Focused history

History	Questions	Why it matters
Steroid exposure	Which steroid, dose, route, duration, last dose, recent taper, injections, creams, inhalers or traditional medicines?	Identifies exogenous Cushing and risk of adrenal suppression.
Endocrine symptoms	Weight change, weakness, bruising, striae, menstrual change, libido, headache or visual problems?	Distinguishes chronic cortisol excess and pituitary mass effects.
Acute danger	Fever, cough, dysuria, wounds, chest pain, dyspnoea, leg swelling, severe headache, confusion or fracture?	Searches for infection, thromboembolism, stroke, fracture and hypertensive complications.
Metabolic history	Diabetes readings, thirst/urination, hypertension, potassium problems, kidney disease or heart failure?	Guides glucose, fluid and electrolyte risk.
Psychosocial	Sleep, mood, mania, hallucinations, suicidal thoughts, food access and support at home?	Cortisol excess can cause severe psychiatric illness and poor adherence.

Investigations

Immediate tests: bedside glucose, ECG, pulse oximetry, urinalysis, full blood count, electrolytes (especially potassium), urea/creatinine and infection markers.
Confirming cortisol excess: endocrinology may use late-night salivary cortisol, 24-hour urinary free cortisol or an overnight low-dose dexamethasone suppression test. Acute stress and exogenous steroids can distort results.
Localising the source: ACTH, pituitary MRI, adrenal CT or other imaging is performed after biochemical confirmation and specialist review.
Complication tests: blood cultures, chest imaging, troponin, CT pulmonary angiography/ultrasound when thromboembolism is suspected, bone imaging after trauma and visual-field testing for pituitary disease.
Do not delay emergency treatment while waiting for endocrine tests when the patient has sepsis, shock, dysrhythmia, pulmonary embolism, hypertensive emergency or severe hyperglycaemia.

Immediate management of common complications

Complication	Emergency priorities	Important caution
Sepsis/infection	ABCDE, cultures where possible, prompt antimicrobial pathway, fluids/vasopressors if shock and source control.	Steroid immunosuppression may blunt fever and inflammatory signs.
Hypertensive emergency	Monitor ECG, BP and neurological status; urgent medical treatment using controlled IV antihypertensives.	Do not rapidly lower BP without a monitored protocol.
Hyperglycaemia/DKA	Check glucose/ketones, ABCDE, fluids and urgent DKA pathway.	Never assume steroid-related hyperglycaemia is harmless.
Hypokalaemia	ECG monitoring, repeat potassium/magnesium and cautious replacement according to local protocol.	Renal impairment and digoxin use increase arrhythmia risk.
VTE/PE	Oxygen for hypoxaemia, urgent imaging/anticoagulation decision and critical-care escalation.	Assess bleeding risk, recent surgery and fracture before anticoagulation.
Psychosis/suicidality	Calm environment, remove hazards, one-to-one observation and mental-health emergency assessment.	Do not dismiss new psychiatric symptoms as “just steroid mood.”

Hospital and definitive management

Exogenous steroids: the prescriber/endocrinologist plans gradual dose reduction or conversion to physiologic replacement; abrupt cessation is unsafe after prolonged exposure.
Pituitary Cushing disease: transsphenoidal pituitary surgery is commonly first-line when appropriate; persistent disease may require medication, radiation or further surgery.
Adrenal or ectopic cortisol source: specialist surgery, oncological treatment or cortisol-lowering medicines may be required.
Medical cortisol control: endocrine teams may use steroidogenesis inhibitors or glucocorticoid-receptor antagonism with close liver, electrolyte, ECG and cortisol monitoring.
Treat hypertension, diabetes, osteoporosis, infection and psychiatric complications in parallel; do not wait for definitive tumour treatment.
After treatment of endogenous Cushing syndrome, the hypothalamic-pituitary-adrenal axis may remain suppressed. Steroid replacement and stress-dose planning may be necessary until recovery is documented.

Nursing and EMT interventions

Trend vital signs, glucose, potassium, mental state, pain, fluid balance, temperature and infection signs.
Use falls and fracture precautions; provide assistance with transfers, toileting, bathing and stair use.
Inspect skin and pressure areas, use gentle handling, support wound care and report cellulitis, thrush or delayed healing.
Administer medicines exactly as prescribed, double-check steroid route/dose and document the last dose and missed doses.
Provide nutrition advice through the clinical team: adequate protein, calcium/vitamin D when appropriate, moderated sodium and glucose-conscious meals.
Use therapeutic communication; screen for depression, mania, psychosis and suicidal thinking and escalate immediately when risk is present.
Teach the patient to carry a steroid emergency card/medical alert and a written sick-day plan when adrenal suppression is possible.

Complications and prevention

Prevent infection through vaccination review, hand hygiene, early wound assessment and prompt treatment of fever or respiratory symptoms.
Prevent VTE through risk assessment, mobilisation when safe, hydration and prescribed prophylaxis.
Reduce fracture risk with fall prevention, bone-density review and safe lifting; never encourage strenuous exercise during severe proximal weakness.
Monitor BP, glucose, potassium, lipids, weight, eyes, kidneys and mental health during long-term treatment.
Do not share steroid medicines, use potent creams without advice or stop chronic steroids suddenly.

Clinical scenarios

Scenario 1 — Infection hidden by steroids: A patient on long-term prednisolone has mild temperature elevation, confusion, tachycardia and a painful leg wound. Do not be reassured by the modest fever. Perform ABCDE, check glucose/lactate, obtain cultures where possible, start the sepsis pathway and arrange urgent hospital care.

Scenario 2 — Hypokalaemic weakness: A patient with rapid Cushingoid features has muscle weakness, BP 190/120 and palpitations. Place on ECG monitoring, check potassium/glucose/renal function, assess for hypertensive emergency and arrange urgent medical/endocrine review. Do not give potassium blindly or treat the BP with an unmonitored rapid drop.

Scenario 3 — Steroid withdrawal: A patient abruptly stops months of dexamethasone and develops vomiting, abdominal pain, profound weakness, hypotension and confusion. Suspect adrenal crisis, not “Cushing relapse.” Activate resuscitation, obtain cortisol/ACTH if this does not delay care, give emergency hydrocortisone and isotonic saline/dextrose under protocol, and transfer urgently.

Common errors to avoid

Diagnosing Cushing syndrome from body shape alone without reviewing steroids and confirming cortisol excess.
Stopping prescribed glucocorticoids abruptly or withholding stress-dose treatment in a seriously ill steroid-dependent patient.
Missing sepsis, pulmonary embolism, fracture, stroke, DKA, hypokalaemia or psychiatric emergency because symptoms are attributed to cortisol.
Using a random cortisol level as a stand-alone diagnostic test during acute stress.
Ignoring inhaled, topical, injected, traditional or “beauty” steroid products in the medication history.

CORTISOL SAFE: C — Check steroid exposure; O — Observe airway, breathing and circulation; R — Recognise infection/VTE/BP/glucose danger; T — Test glucose, potassium and ECG; I — Involve endocrine/medical teams; S — Support skin, bones and mental health; O — Omit no steroid abruptly; L — Link the patient to follow-up; S — Sick-day and steroid-alert education; A — Assess adrenal crisis after withdrawal; F — Falls/fracture precautions; E — Escalate deterioration.

Revision questions

Differentiate Cushing syndrome from Cushing disease and list common exogenous steroid sources.
Explain how cortisol excess causes hypertension, hyperglycaemia, hypokalaemia, infection and osteoporosis.
Which emergency findings require immediate transfer in a patient with suspected Cushing syndrome?
Why can steroid withdrawal produce adrenal crisis?
List the key questions in a steroid medication history.
Outline the EMT priorities for Scenario 1 and Scenario 3.

Key takeaways

Cushing syndrome is a chronic cortisol-excess state with acute complications. Treat the immediate emergency, search actively for infection, thromboembolism, hypertension, glucose and potassium problems, document every steroid exposure, and never stop long-term glucocorticoids abruptly.

References for further study

NIDDK. Cushing’s Syndrome — causes, diagnosis and definitive treatment.
Endocrine Society. Primary Adrenal Insufficiency Guideline Resources — immediate treatment principles for adrenal crisis.
Endocrine Society/ESE. Glucocorticoid-Induced Adrenal Insufficiency Guideline, 2024.
NHS. Cushing’s syndrome — clinical overview and long-term risks.
Use current Uganda Ministry of Health, hospital and endocrine protocols for steroid tapering, adrenal crisis, hypertension, infection and thromboembolism.