Primary adrenal insufficiency | All causes. Commonest causes are Addison's disease, congenital adrenal hyperplasia, bilateral adrenalectomy and adrenal haemorrhage |
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Pituitary/hypothalamic disease | Patients with hypothalamo-pituitary dysfunction known to be steroid dependent Patients with hypothalamo-pituitary dysfunction advised to take steroids for intercurrent illness |
Other causes | Exogenous steroids
Repeated doses of exogenous steroids or where there are clinical concerns about AI |