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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.
Common Brain Fog/Fatigue Causes. Common Causes of Brain Fog: How to Deal with Brain and Mental Fatigue. As the body ages, one's memory can slowly start to fade and momentary lapses of confused thinking can become more common. This is a natural process but in some cases brain fog and fatigue can be accelerated by certain situations or conditions. Understanding the common causes of brain fatigue is essential for maintaining good health practices that will keep the brain clear-thinking and healthy for as long as possible.