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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 causes of adrenal cancer are not known, but it is more likely to occur in the cortex, the outer portion of the adrenal gland, than in the medulla, the central portion of the gland. The adrenal glands produce several hormones, which can be produced in excess when cancer is present.he causes of adrenal cancer are not known, but it is more likely to occur in the cortex, the outer portion of the adrenal gland, than in the medulla, the central portion of the gland. The adrenal glands produce several hormones, which can be produced in excess when cancer is present.