| Acute Pain | Chronic Pain | |
|---|---|---|
| Onset | Current. | Continuous or intermittent. |
| Duration | <6 mo. | >6 mo. |
| ANS response | !!UpArrow!! HR, RR, BP, muscle tension, diaphoresis, pupillary dilation. | Rarely present. |
| Relevance to healing | Diminishes as healing occurs. | Continues long after healing. |
| Analgesics | Responsive. | Rarely responsive. |