There are three major types of<unk> . * Primary<unk>  is due to impairment of the adrenal glands. * 80% are due to an autoimmune disease called Addison's disease or autoimmune adrenalitis. * One subtype is called idiopathic, meaning of unknown cause. * It can also be due to congenital adrenal hyperplasia or an adenoma (tumor) of the adrenal gland. * Other causes include; Infections (TB, CMV, histoplasmosis, paracoccidioidomycosis), vascular (hemorrhage from sepsis, adrenal vein thrombosis, HIT), deposition disease (hemochromatosis, amyloidosis, sarcoidosis), drugs (azole anti-fungals, etomidate (even one dose), rifampin, anticonvulsants) * Secondary<unk>  is caused by impairment of the pituitary gland or hypothalamus. Its principal causes include pituitary adenoma (which can suppress production of adrenocorticotropic hormone (ACTH) and lead to adrenal deficiency unless the endogenous hormones are replaced; secondary<unk>  can be caused by steroids, inhaled steroids such as Flovent; and Sheehan's syndrome, which is associated with impairment of only the pituitary gland. * Tertiary<unk>  is due to hypothalamic disease and a decrease in the release of corticotropin releasing hormone (CRH). Causes can include brain tumors and sudden withdrawal from long-term exogenous steroid use (which is the most common cause overall).
Adrenal insufficiency
Postural orthostatic tachycardia syndrome  Postural orthostatic tachycardia syndrome  1
Adrenal fatigue
Precocious puberty
Hypogonadism
Adrenalitis
Thyroid storm
Organomegaly