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Adrenaline is one of the body's most important stress chemicals. It is secreted from the adrenal glands, which sit atop each kidney. Adrenaline also plays a key role as a neurotransmitter that facilitates communication between brain cells, or neurons, and other cells. An adrenaline rush is a sudden increased secretion of adrenaline from the adrenal glands. It causes an increase in heart rate and respiration. Adrenaline rushes can be healthy responses to actual threats to a person's well-being or symptoms of an underlying mental disorder.
The adrenal gland has a center gland (medulla) that produces adrenaline and an outer gland (the cortex) that produces several hormones, such as cortisol an aldosterone. This page is about cortisol overproduction by the adrenal cortex.Causes of Cushing's Syndrome.t is now known that these symptoms characterize Cushing's syndrome, which is the result of excess production of cortisol by the adrenal glands. Cortisol is a powerful steroid hormone, and excess cortisol has detrimental effects on many cells throughout the body.