Jitters (noun)

A state of nervousness or anxiety, typically characterized by trembling or shaking.

Origin:

Originated in the early 20th century, of uncertain origin, it is likely a colloquialism.

Examples:

1. She had a case of the jitters before her big presentation.
2. He woke up with the jitters on the day of his wedding.
3. The jitters were caused by the caffeine in the coffee.
4. The jitters were a common symptom before a big game.
5. The jitters were so bad that he couldn't hold a steady hand to sign the document.