Pain is an unpleasant sensory and emotional experience and is, therefore, always associated with an emotion. Additionally, this pain may be due to actual or potential damage. Pain is, therefore, a subjective concept and exists whenever a patient says that something hurts.
It is a very prevalent pathology in the general population and has a great socioeconomic impact, as it is very disabling. Any pain lasting more than 3 months is considered chronic pain.