Why do people shake in anticipation?

Why do people tremor when something stressful or exciting happens?

maybe it has something to do with a stress response and adrenaline being pumped.

Yip. According to my psychologist, anticipation is really a form of mild anxiety. The physiological response is the same. It’s the reason a lot of people like rollercoasters and scary movies.

One thing I had to learn about my panic disorder is that the responses are not inherently bad. I was told to remember the good times when I had the trembling sensation.