When they experience it they are probably being focused on by most of the crowd or are just really nervous about what their doing in front of whoever. They just stop freak out and think about it to much, that causes them to most likely have stage freight
The effects of stage fright is when someone starts to feel the sensation of being scared or nervous they start to experience anxiety. According to a Harvard Mental Health Letter, "Anxiety usually has physical symptoms that may include a racing heart, a dry mouth, a shaky voice, blushing, trembling, sweating, lightheadedness, and nausea".
