An unpleasant sensation that can range from mild, localised discomfort to agony. Pain has both physical and emotional components. The physical part of pain results from nerve stimulation. Pain may be contained to a discrete area, as in an injury, or it can be more diffuse, as in disorders like fibromyalgia.
Pain is medicated by specific nerve fibres that carry the pain impulses to the brain where their conscious appreciation may be modified by many factors.