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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.
In amyloidosis, proteins are deposited in organs and tissues. As they build up, they prevent normal function of various parts of the body, causing the adrenal glands to swell or become enlarged. Chronic Infection and Enlarged Adrenal Glands # Chronic infections, such as bronchitis and pneumonia or other infections that compromise the respiratory system, can cause the adrenal glands to become overworked and fatigued, which may make them enlarged or swollen.