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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.
Often the problem is chronic and worsens when the person is fatigued, or under stress. An adrenal insufficiency is the major cause of allergies to pollen, dusts, molds, animal hair, foods and environmental chemicals. An adrenal insufficiency-caused allergy can be readily identified from a hair mineral analysis.