Which of the following is a common sign of a panic attack?

Rapid breathing and heart palpitations are indeed common signs of a panic attack. During a panic attack, the body enters a "fight or flight" mode, which results in a surge of adrenaline and other stress hormones. This physiological response can lead to hyperventilation (rapid breathing), as the body is attempting to take in more oxygen. As a result, many individuals experience an increased heart rate or palpitations, contributing to their feelings of anxiety and panic. These symptoms can feel overwhelming and often prompt individuals to believe they are experiencing a medical emergency, amplifying their distress.

In contrast, sudden nausea and vomiting, while they may occur in some anxiety-related situations, are not hallmark signs of a panic attack. Chest pain and excessive sweating can also occur, but they are more commonly associated with other conditions or severe panic attacks rather than being defining features. Uncontrollable laughter and giddiness are generally not associated with panic attacks, as they do not reflect the intense anxiety and fear that characterize this condition.