An adrenaline rush is the fight or flight response of the adrenal gland, in which it releases adrenaline (epinephrine).

When releasing adrenaline, one's body releases dopamine and endorphin which can act as a natural pain killers.

Chronic stress or anxiety can cause your nervous system to release adrenaline, which acts to narrow the blood vessels that supply blood to the hands and feet.

When you're embarrassed, your body releases adrenaline.

It prepares for the coming fight by releasing adrenaline, increasing respiration, changing blood-flow patterns, and sharpening the senses.

Thinking the body is in an emergency, the pituitary gland initiates the body's "fight or flight" response by releasing adrenaline.

Located at the base of the brain, the hypothalamus stimulates the center of the adrenal gland, called the adrenal medulla, to release adrenaline.

During states of excitement or stress, the body releases adrenaline.

If you have post-traumatic stress disorder (PTSD), your body may release too much adrenaline.

These glands release adrenaline (epinephrine) and noradrenaline (norepinephrine), hormones that create the state of readiness that helps a human confront danger.