Acute pain refers to the normal, predicted physiological response to a noxious chemical, thermal or mechanical stimulus and typically is associated with invasive procedures, trauma and disease.
It is generally time-limited.
Other definition:
Acute pain refers to a pain that typically follows an injury and disappears once the injury heals or is effectively treated.
Other /More definition:
Acute Pain refers to the distress in any dimension of an individual's life that is characteristically time limited, although it may recur; may be mild, moderate, or intense. It is a short-term pain that results from tissue damage or other trauma.