Fear (noun): “an unpleasant emotion or thought that you have when you are frightened or worried by something dangerous, painful, or bad that is happening or might happen.” fear: definition What happens when we are scared? The fight-or-flight response begins in the amygdala. The amygdala signals the hypothalamus, which then activates the pituitary gland. The pituitary gland is where the nervous system meets the endocrine, or hormone, system. Other things that happen: The sympathetic nervous…