When people shout loudly and forcefully, they will hold their breath, and the neck muscles will tighten and compress the carotid artery. The above two points explain the effect of shouting on the human brain anatomically, which will cause insufficient blood supply and oxygen supply to the brain for a short time. Therefore, if you shout loudly and forcefully for a long time, it will cause dizziness and discomfort. This long time is not good for the brain. However, people can adjust themselves and improve themselves. Many students who have just started practicing flute and trombone have symptoms of dizziness at first, but with more practice and correct breathing methods, they can recover.