Pain refers to any type of physical discomfort in any part of the body​, which may be localised or more generalised​. Pain may be acute, chronic, continuous, intermittent, occur at rest or with movement​. Pain evolved to cause creatures to terminate damage and to rest to allow healing​. It is essential for survival and maintaining the integrity of the organism​. This is good pain​. Bad pain occurs when the protective mechanism of pain gets out of control and leads to suffering​ – the emotional experience that accompanies pain​.

Pain evolved to cause creatures to terminate damage and to rest to allow healing​ [Image: Shutterstock].

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