Which of the following is a sign associated with an acute injury?

The presence of immediate pain is a key characteristic of an acute injury. Acute injuries often result from a specific, sudden incident, such as a fall, a collision, or a misstep. This sudden trauma typically leads to an immediate sensation of pain, which can vary in intensity but is usually sharp and noticeable. Immediate pain serves as a vital signal from the body, indicating damage or stress to tissues that may require prompt medical attention or intervention.

In contrast, low-grade discomfort tends to be associated with chronic conditions or overuse injuries rather than acute incidents. Stiffness that develops over time is typically a sign of chronic conditions or prolonged inactivity, as opposed to the rapid onset typical of acute injuries. Progressive pain intensity may suggest a worsening condition over time, often relating to a chronic issue rather than an immediate reaction to a specific injury. Hence, the immediate pain is the most definitive sign indicating an acute injury.