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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.
There are certain diseases which cause your body to overproduce adrenaline. The main symptom of excess adrenaline is high blood pressure. Long term high blood pressure can cauâ¦se heart disease and stroke. Pheochromocytoma, which is a tumor of the adrenal gland, causes sporadic bursts of adrenaline. These bursts of adrenaline are often mistaken for panic attacks. They can cause episodes of extremely high blood pressure (250/120 or higher) which can be fatal.