Acute Vs Chronic Pain

Acute and chronic pain are not separated by intensity. A person can have severe acute pain after surgery or mild chronic pain from osteoarthritis. The more useful distinction is the pattern and time course. Acute pain commonly begins with tissue injury, inflammation, or a procedure. Nociceptors signal potential harm, and the resulting pain encourages guarding and protection while healing occurs. Sympathetic activation may produce tachycardia, elevated blood pressure, diaphoresis, muscle tension, or shallow movement, although these findings are not present in every patient. Chronic pain persists or recurs beyond the expected period of healing, commonly for more than three months. Persistent input from injured tissues, altered peripheral nerve signalling, and changes in central pain processing may lower the threshold for pain. The pain is real even when the original injury has healed or no single structural lesion explains its severity. Sleep disruption, reduced mobility, low mood, and loss of function can then amplify disability. The two patterns can coexist. A patient with chronic back pain may sustain an acute fracture, develop an infection, or experience a new neurological problem. Calling...