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Chronic pain is defined as pain that persists for more than three months, in contrast to acute pain which is limited. Chronic pain may be the result of injury, infection, or chronic disease and can manifest as low back pain, migraines, arthritis, neuralgias or neurological diseases affecting various nerves, cancer, and even psychogenic pain where no physical cause can be found. Chronic pain more commonly affects older adults and can be unrelenting (without relief) or intermittent (continuing to come and go).