Online Medical Dictionary and glossary with medical definitions ... Pain: An unpleasant sensation that can range from mild, localized discomfort to agony.

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Pain Definition. Pain is an unpleasant feeling that is conveyed to the brain by sensory neurons. The discomfort signals actual or potential injury to the body.

pain   (p n) n. 1. An unpleasant sensation occurring in varying degrees of severity as a consequence of injury, disease, or emotional disorder. 2. Suffering or distress.