English: Fig. 1. Venn diagram for type of pain and chronicity. Pain from a minor foot sprain would be considered normal and nociceptive because it is signaled by tissue injury (i.e., a normal mechanism). Inflammatory pain from arthritis (center) is an example of a nociceptive mechanism because inflammation is the cause of pain. Inflammation is also pathophysiologic because it involves an altered (i.e., disease) state. NP is at the right, considered only as pathophysiologic because pain is elicited by abnormal pain mechanisms. Normal pain is only acute, whereas inflammatory or NP may be acute or chronic. Medical images taken from