​Differentiate among the three stages of pain.

A. Acute pain
1. This type of pain is the most common, produced by injury from lacerations, dental work, surgery, burns, abrasions, cuts, and other injuries.
2. This type of pain is adaptive, signaling injury to body tissue and alerting the person to avoid further injury.
B. Pre-chronic pain
1. This type of pain is experienced between acute and chronic pain.
2. The experiences that occur during this period may make the critical difference in the alleviation of pain or the onset of chronic pain.
C. Chronic pain
1. This type of pain persists after the period of healing has been completed and is often experienced without detectable tissue damage.
2. This type of pain is often involved with situations that elicit reinforcement for the person who is in pain such that continued pain ensures reinforcement although it also ensures pain.
3. This type of pain never has a biological benefit but takes a substantial psychological toll on both the sufferer and the family