Pain is an unpleasant sensation felt when a tissue is damaged and provokes the reaction of certain receptors that may be in the viscera, the muscles, or the skin. Pain is the result of a nociceptive (nerve) message transmitted to the brain by peripheral nerves
via the spinal cord
. According to individuals and their degree of sensitivity, pain can be felt with a varying level of intensity. It is considered a sickness in its own right when it is chronic. On the other hand
, acute pain is a symptom
rather than a disease.