What causes a person to blush and why do people blush?

What causes a person to blush and why do people blush?What causes a person to blush and why do people blush?
When you're embarassed your body releases adrenaline. Adrenaline causes your blood vessels to dilate (called vasodilation), in order to improve blood flow and oxygen delivery. This is the case with blushing. The veins in your face respond to a signal from the chemical transmitter adenylyl cyclase, which tells the veins to allow the adrenaline to do its magic. As a result, the veins in your face dilate, allowing more blood to flow through them than usual, creating the reddened appearance that tells others you're embarrassed. In other words, adrenaline causes more local blood flow in your cheeks.What causes a person to blush and why do people blush?
I thinks it a blood rush to your cheeks and it mostly when your shy or embarrassed or something...it might just be your body showing your emotions.