When impulses from nerve fibers reach the brain to be processed, people experience pain. Usually the result of tissue damage, pain enables the body to respond and avoid damage. Everybody experiences pain differently, and there are many different ways to feel and express pain. In certain situations, this variance may make it difficult to identify and manage pain. Pain might be localized, lasting a short while, or it can spread throughout the body. When certain nerves known as nociceptors identify tissue injury and send information about the damage to the brain via the spinal cord, people experience pain. For instance, contacting a heated surface will trigger an instantaneous muscle contraction by sending a signal along the spinal cord's reflex arc. In order to prevent more harm, this contraction will draw the hand away from the heated surface.
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