7 Signs Someone Is Unhappy

Shaking or trembling of the hands or other parts of the body is a common physical symptom you may experience as part of social anxiety disorder (SAD). When your shaking is caused by anxiety, it is a result of your body's fight-or-flight response.Your body prepares to deal with the stressor, interpreting the anxiousness as a signal that you'll need to stand your ground or escape from danger. Your muscles become primed to act, leading to a trembling sensation, twitching, or shaking.