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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.
Causes of an adrenaline rush - Can high bloos pressure cause head rushes like a adrenaline rush and irritate anxiety? High BP. Hypertension is usually without symptoms unless BP is very high or it was present for a long time, then such symptoms are possible. Work with your doctor to monitor your BP & medications.