Acute pain and chronic pain
The pain is a phenomenon worth our body and perform an important function and protection alarm that indicates that something is wrong. The body reacts to pain and trying to prevent pain or limit the conditions by countermeasures against.
A well-known example: in contact with a hot plate, we will immediately withdraw our hand, reflexively, before even really feel the pain. The pain is limited in time and can often be treated successfully by treating the cause. The pain of losing this function alarm when it becomes chronic. Chronic pain patients use physically and can completely invade his thoughts and his sensory and emotional world. They eventually to weigh more than their cause.