What Questions to Ask in a Patient with Suspected Cushing Syndrome
Before any biochemical testing, you must obtain a thorough drug history to exclude exogenous glucocorticoid exposure, as this is the most common cause of Cushingoid features and pursuing testing without this exclusion leads to unnecessary investigations and harm. 1
Essential Drug History Questions
Ask specifically about all routes of glucocorticoid administration:
- Oral medications (prednisone, dexamethasone, hydrocortisone)
- Topical preparations including skin creams and bleaching agents
- Inhaled steroids for asthma or COPD
- Injections for joints, nerves, or epidural use
- Rectal preparations
- Herbal medications and "tonics" that may contain undisclosed steroids
- Megestrol acetate (Megace) or medroxyprogesterone, which have glucocorticoid activity 1
Clinical Features to Inquire About
Once exogenous glucocorticoid use is excluded, focus on features with high discriminatory value that distinguish true Cushing's syndrome from pseudo-Cushing states 1:
High-Yield Discriminatory Features (Ask About These First):
- Proximal muscle weakness - difficulty rising from chair, climbing stairs, lifting objects
- Facial plethora - persistent facial redness
- Wide purple striae (>1 cm) - particularly on abdomen, breasts, arms
- Easy bruising with minimal trauma
- Thin, fragile skin that tears easily
- Supraclavicular fat pads - fullness above collarbones 2
Progressive Feature Assessment:
Ask about temporal progression - Cushing's syndrome tends to worsen over time, so inquire about:
- When symptoms first appeared
- Whether features are accumulating or worsening
- Review old photographs with the patient to document physical changes over months to years 1
Additional Clinical Features to Query:
- Weight gain - particularly central/truncal obesity with thin extremities
- Mood changes - depression, anxiety, irritability, emotional lability
- Fatigue and weakness
- Menstrual irregularities in women (oligomenorrhea, amenorrhea)
- Decreased libido in men
- Hirsutism or male-pattern baldness in women
- Acne (new onset or worsening)
- Sleep disturbances
- Cognitive difficulties - memory problems, concentration issues 1, 2
Age-Specific Questions
In Children:
The combination of decreased height velocity with increased weight is highly sensitive and specific 1:
- Growth deceleration - falling off growth curve
- Weight gain - crossing upward on weight percentiles
- Delayed puberty or pseudoprecocious puberty
- Short stature relative to family height 3, 4
Critical point: Do not pursue Cushing's testing in obese children unless their linear growth rate has slowed 1.
Comorbidity-Focused Questions
Ask about conditions that may be manifestations of hypercortisolism, particularly if onset at younger age or difficult to control 1:
- Hypertension - especially if young onset or poorly controlled
- Diabetes mellitus or impaired glucose tolerance
- Osteoporosis or fragility fractures - particularly in young patients
- Kidney stones (nephrolithiasis)
- Recurrent or unusual infections due to immunosuppression
- Polycystic ovary syndrome features
- Metabolic syndrome components 1, 5
Incidental Findings:
- Adrenal incidentaloma discovered on imaging for other reasons 1
Conditions That Mimic Cushing's (Pseudo-Cushing States)
Ask about conditions that can cause false-positive screening tests 1:
- Alcohol dependence - quantity and frequency
- Depression or psychiatric conditions - current treatment
- Severe/morbid obesity
- Poorly controlled diabetes
- Pregnancy status
- Intense chronic exercise
- Eating disorders - anorexia, malnutrition
- Recent hospitalization, surgery, or acute illness
Key Clinical Pitfalls to Avoid
The 2021 Lancet guideline and 2008 Endocrine Society guideline emphasize that random cortisol or ACTH levels should never be used for screening 1. The specificity of clinical features alone is limited because many features overlap with common conditions in the general population 6, 7. However, the presence of multiple progressive features, especially those with high discriminatory value, substantially increases pretest probability and justifies biochemical testing 1.
Do not screen populations without specific clinical features - widespread indiscriminate testing leads to high false-positive rates and patient harm from unnecessary investigations 1.