Why do people blush

You’re standing behind an attractive woman in a checkout line and, like a puppet, you unintentionally verbalized your thoughts as though someone else were controlling you. Then, the young woman turns to face whoever made the comment, in this case, you.

You become nervous and in response your body reacts by releasing adrenaline. The adrenaline causes the veins in your cheeks to dilate to facilitate the extra blood flow; and the tell-tale signs of redness in your cheeks give you away. You’re embarrassed, you’re facial blushing.
Blushing is your body’s natural response to embarrassment. It is so common that, if it weren’t for the crippling self-consciousness that prompts it, it could be as easily dismissed as the blinking of an eye. But, because it only occurs in response to embarrassment, scientist would like to know more about the psychology this unique body reaction. While they admit that they know very little about the psychology behind blushing, they have a more thorough knowledge about the physical processes involved.
The same system that governs your body’s fight-or-flight response is the same one that produces those tell-tale reddened cheeks whenever you find yourself in an embarrassing situation (Like the one mentioned above). It’s called the sympathetic nervous system. how to stop blushing since it is voluntary, you have no control over its actions. So, try as you might, there’s simply no way you can stop your cheeks from turning red when embarrassed, just as you have no control over the blinking of your eyes.
As stated, when you’re embarrassed, your body releases adrenaline. Adrenaline is a hormone and has a number of effects on the body that are all part of its fight-or-flight response. When adrenaline is released, it speeds up your breathing and pulse rate to prepare you for whatever danger you might have to face, or flee. In addition, your pupils grow larger to facilitate a wider range of vision, and the digestive process is interrupted so that more energy can be redirected to either defending yourself, or fleeing from danger. The extra activity your body undergoes when adrenaline is released is responsible for the jolt you feel when you become embarrassed.
But why do humans blush in the first place? One theory is that blushing evolved as a natural marker to keep us humans from overstepping social and moral codes that are necessary for the functioning of a civilized society. By blushing when caught in an embarrassing situation, we let others know that we have made a mistake. When others see us blushing, they understand immediately—probably from their own experience—the unpleasant feelings we’re experiencing at that moment.
To this day, no one has developed any techniques for how to stop blushing when embarrassed, or with a cure for blushing altogether. The closest thing to a cure is a surgical procedure. Surgery is used in some extreme cases, such as to treat people with Erythrophobia. During this procedure, the nerves in the spine that control blushing are snipped. This procedure has been known to control blushing to a certain degree.
The fact of the matter is that blushing is a powerful response to certain stimuli—embarrassment—that has evolved in humans over time and, short of a surgical procedure, there is no known cure.