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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.
Chronic stress will overwork the adrenal gland to the point of exhaustion and eventually they become too fatigued to meet the needs of the body. Low cortisol symptoms include fatigue, sugar or salt cravings, low blood sugar, a history of low blood pressure, skin rashes, allergies, poor sleep, depression and anxiety.oo much cortisol can cause symptoms of weight gain around the waist, poor sleep, fatigue, elevated blood sugars, menstrual irregularities, increased thirst, higher blood pressure and even more frequent infections. One of the biggest causes of an overactive adrenal gland is stress.