Actually it is part of a very ancient biological response - the ';fight or flight'; response. It's an involuntary reaction of the sympathetic nervous system, which is responsible for our ';fight or flight'; response, but blushing is solely triggered by social cues.
People generally blush when they're feeling embarrassed, scared, or stressed. As a result of the ';fight or flight'; response, the capillaries that carry blood to the skin widen, and the increased blood flow lends the face, as well as sometimes the chest, neck, or even the body or legs, a reddened color.Why do people blush when they get shy?
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Why do people blush when they get shy?
CUZ BLOOD RUSHES TO YOUR CHEEKS
Due to secretion of harmone in the body which effects the face.