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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.
Steamed broccoli on a board. Your adrenals are small glands with a big job: manufacturing hormones that regulate your bodyâs natural stress response. When stress builds up in your life, these glands can become overwhelmed, causing fatigue, headaches, weakened immunity, sleep disorders and food cravings. Weakened adrenals can also lead to high blood sugar levels, weight gain and inflammation, raising your risk for conditions such as heart disease and Type 2 diabetes.