Which of the following is a common cause of shock?

Excessive pain is a common cause of shock because it can trigger a physiological reaction in the body that leads to a decrease in blood circulation. When someone experiences severe pain, the body activates the sympathetic nervous system, leading to a stress response that can negatively impact heart function and blood flow. This reaction can result in a drop in blood pressure, impaired circulation to vital organs, and ultimately worsen the state of shock.

While allergic reactions to food can also lead to shock, particularly anaphylaxis, they are less common compared to the broad range of situations that can cause excessive pain. Similarly, low blood pressure is a consequence of shock rather than a direct cause, and tight clothing is generally not a recognized factor leading to shock. Therefore, excessive pain stands out as a principal trigger for shock in various situations.